{"id":1083,"date":"2025-12-22T17:17:14","date_gmt":"2025-12-22T10:17:14","guid":{"rendered":"https:\/\/dtabeam.com\/?p=1083"},"modified":"2025-12-26T10:31:21","modified_gmt":"2025-12-26T03:31:21","slug":"diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world","status":"publish","type":"post","link":"https:\/\/dtabeam.com\/en\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/","title":{"rendered":"Diving Deep into Phu Quoc\u2019s Marine Heart \u2013 Exploring the Enchanting Underwater World"},"content":{"rendered":"<header class=\"entry-header\">\n<div class=\"entry-header-text entry-header-text-top text-left\">\n<div class=\"header-meta-info\"><\/div>\n<\/div>\n<div class=\"entry-header-text entry-header-text-top text-left\">\n<div class=\"entry-image relative\">\n<p><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"attachment-large size-large wp-post-image lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/2.jpg\" alt=\"A diverse, colorful coral reef with many small fish swimming in Phu Quoc. Title: Discovering Phu Quoc's Marvelous Coral World\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/2.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/2-768x644.jpg 768w\" \/><\/a><\/p>\n<div class=\"badge absolute top post-date badge-square\">\n<div class=\"badge-inner\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/header>\n<div class=\"entry-content single-page\">\n<p>The first moment you submerge yourself in Phu Quoc\u2019s azure waters is truly an unforgettable experience. Sunlight filters through the surface, casting shimmering, ethereal rays that illuminate a magnificent scene below \u2013 vibrant coral reefs, akin to a living rock forest beneath the ocean. It\u2019s no coincidence that Phu Quoc is celebrated as one of Vietnam\u2019s premier diving destinations. This island boasts astonishing biodiversity, home to\u00a0<b>260 coral species<\/b>\u00a0spanning\u00a0<b>473.9 hectares<\/b>, alongside\u00a0<b>152 diverse reef fish species<\/b>. Notably, Phu Quoc\u2019s coral cover reaches an impressive\u00a0<b>82.5%<\/b>, a figure that underscores the pearl island\u2019s outstanding ecological value.<\/p>\n<div id=\"toc_container\" class=\"no_bullets\">\n<p class=\"toc_title\">MAIN CONTENTS\u00a0<span class=\"toc_toggle\">[<a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#\">hide<\/a>]<\/span><\/p>\n<ul class=\"toc_list\">\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#Coral_Reefs_Living_Rock_Forests\">Coral Reefs \u2013 Living Rock Forests<\/a>\n<ul>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#A_Hard_Corals_Ocean8217s_Master_Architects\">A. Hard Corals \u2013 Ocean\u2019s Master Architects<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#B_Soft_Corals_The_Ocean8217s_Graceful_Dancers\">B. Soft Corals \u2013 The Ocean\u2019s Graceful Dancers<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#C_The_Indispensable_Role_of_Coral_Reefs\">C. The Indispensable Role of Coral Reefs<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#Reef_Dwellers_A_World_of_Colorful_Fish\">Reef Dwellers \u2013 A World of Colorful Fish<\/a>\n<ul>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#A_The_Sparkling_8220Stars8221_of_the_Reef\">A. The Sparkling \u201cStars\u201d of the Reef<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#C_Barrel_Sponges_The_Ocean8217s_Enduring_Guardians\">C. Barrel Sponges \u2013 The Ocean\u2019s Enduring Guardians<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#Benthic_Organisms_The_Silent_Surprising_Dwellers\">Benthic Organisms \u2013 The Silent, Surprising Dwellers<\/a>\n<ul>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#A_Mollusks_Hidden_Treasures_and_Ocean8217s_Reminders\">A. Mollusks \u2013 Hidden Treasures and Ocean\u2019s Reminders<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#B_Diverse_Echinoderms_The_8220Gardeners8221\">B. Diverse Echinoderms \u2013 The \u201cGardeners\u201d<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#C_Other_Marine_Creatures\">C. Other Marine Creatures<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#Natural_Factors_Influencing_Species_Distribution_in_Phu_Quoc\">Natural Factors Influencing Species Distribution in Phu Quoc<\/a>\n<ul>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#1_Unique_Hydrography_and_Water_Environment_of_the_Gulf_of_Thailand\">1. Unique Hydrography and Water Environment of the Gulf of Thailand:<\/a><\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#2_Geological_Formation_History_and_Relative_Isolation\">2. Geological Formation History and Relative Isolation:<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/#Protecting_Our_Natural_Treasure_Our_Collective_Responsibility\">Protecting Our Natural Treasure \u2013 Our Collective Responsibility<\/a><\/li>\n<\/ul>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Coral_Reefs_%E2%80%93_Living_Rock_Forests\"><\/span><span id=\"Coral_Reefs_Living_Rock_Forests\"><b>Coral Reefs \u2013 Living Rock Forests<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Phu Quoc\u2019s coral reefs are not merely habitats for countless marine creatures but also exquisite natural architectural wonders, sculpted over millions of years. One can imagine them as towering underwater cities, where all life finds its unique space.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"A_Hard_Corals_%E2%80%93_Oceans_Master_Architects\"><\/span><span id=\"A_Hard_Corals_Ocean8217s_Master_Architects\"><b>A. Hard Corals \u2013 Ocean\u2019s Master Architects<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Hard corals form the foundational, robust structure of the reef.\u00a0<b>Many people mistakenly think these massive structures are just inert rocks, but the truth is, these are living organisms, complex colonies of tiny polyps that slowly build these impressive limestone formations over centuries.<\/b>\u00a0In Phu Quoc, you\u2019ll encounter\u00a0<b>four dominant genera of hard corals<\/b>, each possessing a unique morphology that adorns the underwater landscape:<\/p>\n<p><a href=\"https:\/\/onbird.vn\/brain-coral-phu-quoc-coral-observation\/\"><b>Brain Coral (Porites):<\/b><\/a>\u00a0True to their name, these coral colonies feature a complex, convoluted structure resembling the ocean\u2019s gigantic brain, often adorned in yellowish-brown hues. They form sturdy, resilient walls, providing ideal shelter for countless small fish and benthic creatures. These corals are particularly resilient to harsh environmental conditions.<\/p>\n<div id=\"gallery-1\" class=\"gallery galleryid-56680 gallery-columns-2 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/3-12\/#main\"><img decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/3-2.jpg\" alt=\"Two people are diving, observing large brain coral under clear blue water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/3-2.jpg\" aria-describedby=\"gallery-1-56997\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/3-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/3-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/3-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-1-56997\" class=\"wp-caption-text gallery-caption\">Snorkeling to admire giant brain coral and colorful Phu Quoc sea.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/29-2\/#main\"><img decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/29-2.jpg\" alt=\"Close-up of a massive brain coral (Porites) colony with a complex surface in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/29-2.jpg\" aria-describedby=\"gallery-1-57195\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/29-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/29-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/29-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-1-57195\" class=\"wp-caption-text gallery-caption\">Phu Quoc\u2019s Brain coral with an unique structure<\/figcaption><\/figure>\n<\/div>\n<p><a href=\"https:\/\/onbird.vn\/honeycomb-coral-diploastrea-heliopora-phu-quoc-coral-observation\/\"><b>Honeycomb Coral (Diploastrea Heliopora):<\/b><\/a>\u00a0Phu Quoc\u2019s largest Honeycomb Coral colony stands an impressive\u00a0<b>3 meters tall<\/b>, with a base diameter of\u00a0<b>6 meters<\/b>. This hard coral is the sole surviving species in its genus, capable of forming enormous dome-shaped colonies.\u00a0<i>Diploastrea Heliopora<\/i>\u00a0is currently classified as\u00a0<b>Near Threatened (NT)<\/b>\u00a0on the IUCN Red List.<\/p>\n<p><a href=\"https:\/\/onbird.vn\/vi\/san-ho-ban-o-phu-quoc-co-gi-dac-biet\/\"><b>Table Coral (Acropora Hyacinthus):<\/b><\/a>\u00a0Resembling giant underwater tables, table corals grow into extensive flat sheets, providing shade and living space for numerous marine species. They contribute to reef stability and serve as important refuges for juvenile fish. This distinctive shape optimizes their ability to absorb sunlight.<\/p>\n<div id=\"gallery-2\" class=\"gallery galleryid-56680 gallery-columns-3 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/4-9\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/4-2.jpg\" alt=\"Two freedivers are swimming near a large Montipora coral reef under sunlight filtering through the water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/4-2.jpg\" aria-describedby=\"gallery-2-57006\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/4-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/4-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/4-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-2-57006\" class=\"wp-caption-text gallery-caption\">Snorkeling with friends to admire the vibrant coral reefs and immerse in the sparkling light under Phu Quoc\u2019s sea.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/5-4\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/5-3.jpg\" alt=\"A panoramic view of a large area with green Table Coral colonies stretching under sunlight filtering through the water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/5-3.jpg\" aria-describedby=\"gallery-2-57015\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/5-3.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/5-3-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/5-3-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-2-57015\" class=\"wp-caption-text gallery-caption\">Vibrant Table Coral under the sun, creating a majestic and lively underwater landscape in Phu Quoc.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/31-2\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/31-2.jpg\" alt=\"Snorkeling above a large green Table Coral field under clear blue water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/31-2.jpg\" aria-describedby=\"gallery-2-57213\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/31-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/31-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/31-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-2-57213\" class=\"wp-caption-text gallery-caption\">Snorkeling to admire vast Table Coral carpets, a unique beauty beneath Phu Quoc\u2019s sea.<\/figcaption><\/figure>\n<\/div>\n<p><b>Cactus Coral (Pavona):<\/b>\u00a0These corals create majestic \u201cmountain ranges\u201d beneath Phu Quoc\u2019s waters, especially at\u00a0<a href=\"https:\/\/onbird.vn\/phu-quoc-undersea-coral-mountain-phu-quoc-snorkeling\/\"><b>Coral Mountain<\/b><\/a>. Their distinctive undulating shapes thrive in shallow waters, making this location the island\u2019s largest cactus coral reef. Their vibrant beauty and robust growth significantly contribute to the irresistible allure of Phu Quoc\u2019s marine ecosystem.<\/p>\n<p><strong>| Learn more: Snorkeling to explore Phu Quoc Coral Mountain \u2013 a hidden gem right under the sea surface<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"B_Soft_Corals_%E2%80%93_The_Oceans_Graceful_Dancers\"><\/span><span id=\"B_Soft_Corals_The_Ocean8217s_Graceful_Dancers\"><b>B. Soft Corals \u2013 The Ocean\u2019s Graceful Dancers<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In stark contrast to the rigidity of hard corals, soft corals exude surprising fluidity and grace, moving like dancers swaying to the ocean\u2019s rhythm. Phu Quoc hosts\u00a0<b>8 diverse species of soft corals<\/b>, boasting brilliant hues of orange, red, purple, and yellow. They inject vibrant accents, breaking the monotony of hard coral formations and captivating every eye. Unlike hard corals, soft corals lack a calcified skeleton; instead, they possess tiny spicules that provide structural support.<\/p>\n<div id=\"gallery-3\" class=\"gallery galleryid-56680 gallery-columns-3 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/58\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/58.jpg\" alt=\"Close-up of a pale yellow finger coral colony extending from the seabed in Phu Quoc with a diver above.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/58.jpg\" aria-describedby=\"gallery-3-57267\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/58.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/58-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/58-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-3-57267\" class=\"wp-caption-text gallery-caption\">Discovering soft finger coral, a charming part of Phu Quoc\u2019s underwater world.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/34\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/34-2.jpg\" alt=\"A freediver is swimming near a bamboo coral colony with a tree-like structure and smaller coral clusters around it in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/34-2.jpg\" aria-describedby=\"gallery-3-57240\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/34-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/34-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/34-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-3-57240\" class=\"wp-caption-text gallery-caption\">Snorkel to admire bamboo coral, with its unique structure, an unmissable experience in Phu Quoc.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/8-2\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/8-3.jpg\" alt=\"A diver in a striking pink swimsuit is swimming above a large yellow toadstool coral colony with a characteristic wrinkled surface in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/8-3.jpg\" aria-describedby=\"gallery-3-57042\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/8-3.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/8-3-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/8-3-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-3-57042\" class=\"wp-caption-text gallery-caption\">Admiring unique toadstool coral, with its characteristic surface in Phu Quoc waters.<\/figcaption><\/figure>\n<\/div>\n<p><strong>| Learn more:\u00a0<a href=\"https:\/\/onbird.vn\/vi\/3-khac-bie%cc%a3t-giu%cc%83a-san-ho-cung-va-san-ho-mem\/\">03 Differences Between Hard Corals and Soft Corals Base on OnBird\u2019s Observation<\/a><\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"C_The_Indispensable_Role_of_Coral_Reefs\"><\/span><span id=\"C_The_Indispensable_Role_of_Coral_Reefs\"><b>C. The Indispensable Role of Coral Reefs<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Coral reefs are not only beautiful but also play an incredibly vital role as the\u00a0<b>heart of the marine ecosystem<\/b>. They provide safe refuge, feeding grounds, and breeding sites for\u00a0<b>152 species of reef fish<\/b>\u00a0and countless other marine organisms. Corals possess the natural ability to filter seawater, maintaining pristine water clarity, and simultaneously produce oxygen through the photosynthesis of symbiotic algae. Furthermore, coral reefs act as natural barriers, mitigating wave intensity and protecting coastlines from erosion, thus safeguarding the island\u2019s \u201chome\u201d over millions of years through their geological engineering.<\/p>\n<figure id=\"attachment_57231\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57231\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-57231 size-medium lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/33-2-716x600.jpg\" alt=\"A freediver is swimming above a giant reddish-brown barrel coral colony, surrounded by small fish, illustrating the coral reef's role in Phu Quoc's marine ecosystem.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/33-2-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/33-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/33-2-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/33-2.jpg 940w\" \/><figcaption id=\"caption-attachment-57231\" class=\"wp-caption-text\">Coral reefs are not only beautiful but also vital homes and food sources for countless marine creatures in Phu Quoc.<\/figcaption><\/figure>\n<p><strong>| Learn more:\u00a0<a href=\"https:\/\/onbird.vn\/vi\/san-ho-quan-trong-toi-muc-nao-2\/\">How Important Are Coral Reefs?<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Reef_Dwellers_%E2%80%93_A_World_of_Colorful_Fish\"><\/span><span id=\"Reef_Dwellers_A_World_of_Colorful_Fish\"><b>Reef Dwellers \u2013 A World of Colorful Fish<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Phu Quoc\u2019s underwater realm is a\u00a0<b>vibrant tableau<\/b>\u00a0teeming with countless fish species, each boasting unique beauty and behaviors, contributing to the unending richness of the coral reef ecosystem.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"A_The_Sparkling_%E2%80%9CStars%E2%80%9D_of_the_Reef\"><\/span><span id=\"A_The_Sparkling_8220Stars8221_of_the_Reef\"><b>A. The Sparkling \u201cStars\u201d of the Reef<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When diving in Phu Quoc, you\u2019ll easily encounter these \u201cstar\u201d fish species, each with its distinctive appearance:<\/p>\n<p><b>1. Damselfish (Pomacentridae) \u2013 30 species:<\/b>\u00a0This is the most prevalent group of \u201ccitizens\u201d on Phu Quoc\u2019s coral reefs. Though small (only 1-10cm), their sheer numbers form sparkling schools that resemble a myriad of underwater stars. Among them, the most notable include:<\/p>\n<ul>\n<li><b>Pink Skunk Clownfish:<\/b>\u00a0One of the most endearing clownfish species, distinguished by a single white stripe along its back and a white patch across its head. They are among the most peaceful and least aggressive clownfish on the reef, sometimes quite shy. In Phu Quoc, Pink Skunk Clownfish typically choose two species of sea anemones as their home: the Magnificent Sea Anemone (<i>Heteractis magnifica<\/i>) and the Sebae Sea Anemone (<i>Heteractis crispa<\/i>), creating a meaningful symbiotic tableau.<\/li>\n<\/ul>\n<div id=\"gallery-4\" class=\"gallery galleryid-56680 gallery-columns-2 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/14\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-2.jpg\" alt=\"A delighted diver makes a V-sign gesture next to a red-orange clownfish swimming among pink and yellow sea anemones in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-2.jpg\" aria-describedby=\"gallery-4-57078\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-4-57078\" class=\"wp-caption-text gallery-caption\">Meeting adorable clownfish hidden in sea anemones while diving in Phu Quoc.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/15\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/15-2.jpg\" alt=\"Close-up of two pale pink clownfish with white stripes hiding among the pale yellow tentacles of sea anemones in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/15-2.jpg\" aria-describedby=\"gallery-4-57087\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/15-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/15-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/15-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-4-57087\" class=\"wp-caption-text gallery-caption\">Admiring adorable clownfish living symbiotically in sea anemone clusters in Phu Quoc waters.<\/figcaption><\/figure>\n<\/div>\n<ul>\n<li><b>Blue Damselfish:<\/b>\u00a0Often swimming in large schools, they gracefully weave over the coral reefs, forming dazzling streaks of cerulean that evoke a sense of tranquility.<\/li>\n<\/ul>\n<figure id=\"attachment_57069\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57069\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-57069 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/11-3-716x600.jpg\" alt=\"A school of small blue damselfish swimming densely over a large hard coral reef under the clear blue water of Phu Quoc.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/11-3-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/11-3-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/11-3-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/11-3.jpg 940w\" \/><figcaption id=\"caption-attachment-57069\" class=\"wp-caption-text\">Blue damselfish schooling over the coral reef, creating a vibrant scene beneath Phu Quoc\u2019s sea. (Cre: Internet)<\/figcaption><\/figure>\n<p><b>Wrasse (Labridae) \u2013 21 species:<\/b>\u00a0This group of fish is incredibly diverse in size and color, from giant wrasses up to 2m long, majestically gliding like kings of the sea, to the transformative beauty of rainbow wrasses whose vibrant colors change with age and gender. Wrasses are also dubbed the \u201cdoctors\u201d of the coral reef because they often \u201ccleanse\u201d and consume parasites from other fish, contributing to the ecosystem\u2019s health. The\u00a0<b>Parrotfish<\/b>, with their fused, beak-like teeth, act as the silent \u201cbeach architects\u201d of the ocean, scraping off algae and dead coral. Astonishingly, a large parrotfish can produce up to\u00a0<b>450 kg of sand<\/b>\u00a0annually! It is thanks to them that we have such beautiful, pristine white beaches.\u00a0<b>However, beyond the role of parrotfish, another significant portion of beach sand originates from natural geological erosion.<\/b><\/p>\n<figure id=\"attachment_56434\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-56434\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-56434 size-medium lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/13-716x600.jpg\" alt=\"C\u1eadn c\u1ea3nh m\u1ed9t con c\u00e1 v\u1eb9t l\u1edbn m\u00e0u xanh lam v\u00e0 h\u1ed3ng v\u1edbi chi\u1ebfc m\u1ecf \u0111\u1eb7c tr\u01b0ng \u0111ang b\u01a1i tr\u00ean r\u1ea1n san h\u00f4 \u0111\u1ea7y m\u00e0u s\u1eafc \u1edf Ph\u00fa Qu\u1ed1c.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/13-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/13-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/13-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/13.jpg 940w\" \/><figcaption id=\"caption-attachment-56434\" class=\"wp-caption-text\">Colorful parrotfish gliding over the coral reef, an important \u201cgardener\u201d of Phu Quoc\u2019s sea. (Cre: Internet)<\/figcaption><\/figure>\n<p><b>Grouper (Serranidae) \u2013 13 species \u2013 Phu Quoc\u2019s Specialty:<\/b>\u00a0Groupers are not only economically valuable seafood but also a crucial part of Phu Quoc\u2019s coral reef ecosystem. You might spot\u00a0<b>red-spotted groupers<\/b>\u00a0skillfully hiding in rocky crevices, or perhaps be fortunate enough to encounter a\u00a0<b>giant grouper<\/b>\u00a0weighing up to\u00a0<b>400kg<\/b>, a gentle \u201cmonster\u201d of the deep. Notably,\u00a0<b>Honeycomb Groupers<\/b>\u00a0often inhabit offshore reefs and shallow lagoons. They are skilled hunters, primarily preying on small fish, crabs, shrimp, and squid.\u00a0<b>Phu Quoc exhibits an unusually high density of groupers compared to other regions, indicating highly favorable environmental conditions for this species\u2019 thriving.<\/b><\/p>\n<figure id=\"attachment_56443\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-56443\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-56443 size-medium lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-716x600.jpg\" alt=\"C\u1eadn c\u1ea3nh m\u1ed9t con c\u00e1 m\u00fa t\u1ed5 ong v\u1edbi hoa v\u0103n ch\u1ea5m bi n\u00e2u \u0111\u1eadm v\u00e0 v\u00e0ng nh\u1ea1t, n\u1eb1m \u1ea9n m\u00ecnh tr\u00ean r\u1ea1n san h\u00f4 \u1edf Ph\u00fa Qu\u1ed1c.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/14.jpg 940w\" \/><figcaption id=\"caption-attachment-56443\" class=\"wp-caption-text\">Discovering the honeycomb grouper with its unique patterns, a colorful creature of Phu Quoc\u2019s coral reef. (Cre: Internet)<\/figcaption><\/figure>\n<p><b>Peculiar Absences:<\/b>\u00a0Despite being common reef fish elsewhere, Phu Quoc only records\u00a0<b>4 butterflyfish species<\/b>, a relatively modest number. Even more remarkably,\u00a0<b>Parrotfish (Acanthuridae)<\/b>\u00a0are virtually absent \u2013 a rarity in Southeast Asia. Even the\u00a0<b>blue starfish (<\/b><b><i>Linckia laevigata<\/i><\/b><b>)<\/b>\u00a0appears less frequently than in other marine regions.<\/p>\n<p><strong>| Watch more: School of fish swimming freely in a large anemone cluster under the ocean in Phu Quoc<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"C_Barrel_Sponges_%E2%80%93_The_Oceans_Enduring_Guardians\"><\/span><span id=\"C_Barrel_Sponges_The_Ocean8217s_Enduring_Guardians\"><a href=\"https:\/\/onbird.vn\/giant-barrel-sponge-phu-quoc-coral-information\/\"><b>C. Barrel Sponges \u2013 The Ocean\u2019s Enduring Guardians<\/b><\/a><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Among the myriad of life forms adorning Phu Quoc\u2019s reefs, Barrel Sponges (Xestospongia muta) are a constant and striking presence, frequently captured in photos and videos of the underwater landscape. These large, robust sponges, often found in deep water, can live for centuries, growing into impressive, barrel-shaped structures. They are vital filter feeders, sifting vast quantities of water daily to extract microscopic particles, thus significantly contributing to the clarity and health of the marine environment. Their enduring presence highlights the ancient and resilient nature of Phu Quoc\u2019s deep-water ecosystems. Learn more about these fascinating organisms and their role by exploring OnBird\u2019s blog and video content on Barrel Sponges.<\/p>\n<figure id=\"attachment_57258\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57258\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-57258 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/51-716x600.jpg\" alt=\"A freediver hovers above a colossal reddish-brown barrel sponge, encircled by a dense school of small fish, illustrating the coral reef's crucial role within Phu Quoc's marine ecosystem.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/51-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/51-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/51-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/51.jpg 940w\" \/><figcaption id=\"caption-attachment-57258\" class=\"wp-caption-text\">This gigantic barrel sponge, a natural \u201cfilter,\u201d contributes to the pristine clarity of Phu Quoc\u2019s waters and offers sanctuary to diverse fish species.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Benthic_Organisms_%E2%80%93_The_Silent_Surprising_Dwellers\"><\/span><span id=\"Benthic_Organisms_The_Silent_Surprising_Dwellers\"><b>Benthic Organisms \u2013 The Silent, Surprising Dwellers<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Beyond the vibrant coral reefs and colorful fish, Phu Quoc\u2019s seabed is home to countless silent yet crucial organisms that play vital roles in the food chain and maintain the ecosystem\u2019s balance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"A_Mollusks_%E2%80%93_Hidden_Treasures_and_Oceans_Reminders\"><\/span><span id=\"A_Mollusks_Hidden_Treasures_and_Ocean8217s_Reminders\"><b>A. Mollusks \u2013 Hidden Treasures and Ocean\u2019s Reminders<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Trochus snail (Trochus maculatus):<\/b>\u00a0This snail species has a characteristic conical shell and high economic value. You\u2019ll see them slowly crawling on the coral substrate, with an average density of\u00a0<b>4 individuals\/100m\u00b2<\/b>\u00a0in Phu Quoc. Top shells play an important role in cleaning the reef by grazing on algae. Their shells are beautiful and are used as raw material for jewelry.<\/p>\n<figure id=\"attachment_56470\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-56470\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-56470 size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/17.jpg\" alt=\"C\u1eadn c\u1ea3nh m\u1ed9t nh\u00f3m \u1ed1c \u0111\u1ee5n (trochus snail) v\u1edbi v\u1ecf h\u00ecnh n\u00f3n v\u00e0 hoa v\u0103n \u0111\u1ed9c \u0111\u00e1o, b\u00e1m tr\u00ean r\u1ea1n san h\u00f4 ph\u1ee7 t\u1ea3o \u1edf Ph\u00fa Qu\u1ed1c.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/17.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/17.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/17-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/17-768x644.jpg 768w\" \/><figcaption id=\"caption-attachment-56470\" class=\"wp-caption-text\">Discovering the beauty of trochus snails, colorful marine creatures clinging to Phu Quoc\u2019s coral reefs. (Cre: Internet)<\/figcaption><\/figure>\n<p><b>Triton\u2019s Trumpet (Charonia tritonis):<\/b>\u00a0This large snail species, with an impressive spiral shell, is often hunted for souvenirs. However, the Triton\u2019s Trumpet is a\u00a0<b>natural predator of the Crown-of-Thorns starfish<\/b>\u00a0\u2013 a species that can severely damage coral reefs when its population explodes. Protecting Triton\u2019s Trumpets is thus directly protecting the health of Phu Quoc\u2019s coral reefs. They are effective hunters and help control populations of harmful species.<\/p>\n<figure id=\"attachment_56479\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-56479\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-56479 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18.jpg\" alt=\"C\u1eadn c\u1ea3nh m\u1ed9t con \u1ed1c t\u00f9 v\u00e0 (trumpet triton) l\u1edbn v\u1edbi v\u1ecf xo\u1eafn \u1ed1c m\u00e0u kem v\u00e0 n\u00e2u s\u1eabm c\u00f9ng l\u1ed7 mi\u1ec7ng h\u00ecnh trumpet m\u1edf r\u1ed9ng, n\u1eb1m tr\u00ean \u0111\u00e1y bi\u1ec3n \u0111\u1ea7y \u0111\u00e1 v\u00e0 san h\u00f4 \u1edf Ph\u00fa Qu\u1ed1c.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-768x644.jpg 768w\" \/><figcaption id=\"caption-attachment-56479\" class=\"wp-caption-text\">Admiring the impressive spiral shell of the trumpet triton, an important predator in Phu Quoc\u2019s sea. (Cre: Internet)<\/figcaption><\/figure>\n<p><b>Giant Clam (Tridacna squamosa):<\/b>\u00a0Reaching up to\u00a0<b>1 meter<\/b>\u00a0in size, giant clams are among the largest mollusk species globally, resembling enormous coconut shells. They play a crucial role in filtering seawater, helping maintain water clarity, acting as diligent \u201csanitation workers\u201d of the ocean. Giant clams have a symbiotic relationship with algae, producing food for themselves through photosynthesis.<\/p>\n<figure id=\"attachment_57096\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57096\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-57096 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-2-716x600.jpg\" alt=\"Close-up of the undulating blue-purple mantle of a giant clam, nestled within a coral reef on the seabed in Phu Quoc.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-2-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-2-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/18-2.jpg 940w\" \/><figcaption id=\"caption-attachment-57096\" class=\"wp-caption-text\">Discovering the giant clam with its beautiful blue-purple mantle, an impressive highlight beneath Phu Quoc\u2019s sea.<\/figcaption><\/figure>\n<p><strong>Recommendation: When visiting Phu Quoc, admire the beauty of these mollusk species in their natural habitat rather than consuming or collecting them as souvenirs, to protect the ecosystem\u2019s balance.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"B_Diverse_Echinoderms_%E2%80%93_The_%E2%80%9CGardeners%E2%80%9D\"><\/span><span id=\"B_Diverse_Echinoderms_The_8220Gardeners8221\"><b>B. Diverse Echinoderms \u2013 The \u201cGardeners\u201d<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Black Sea Urchin (Diadema setosum):<\/b>\u00a0This sea urchin species possesses long, sharp spines containing mild venom. Despite their intimidating appearance, black sea urchins play a vital role in grazing on algae, helping to clean the coral reefs and prevent excessive algal growth. The density of black sea urchins in Phu Quoc is quite high, reaching up to\u00a0<b>191 individuals\/100m\u00b2<\/b>, indicating their significant role as the ocean\u2019s professional gardeners. They prevent excessive algal growth that can harm corals.<\/p>\n<div id=\"gallery-5\" class=\"gallery galleryid-56680 gallery-columns-2 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/20\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/20-2.jpg\" alt=\"Close-up of a black sea urchin with long, sharp black spines prominently displayed on a colorful coral reef background in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/20-2.jpg\" aria-describedby=\"gallery-5-57114\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/20-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/20-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/20-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-5-57114\" class=\"wp-caption-text gallery-caption\">Admiring the unique beauty of the black sea urchin with its long spines, a common creature on Phu Quoc\u2019s coral reefs.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/19\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/19-2.jpg\" alt=\"Close-up of a black sea urchin with long, sharp black spines prominently displayed on a colorful coral reef background in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/19-2.jpg\" aria-describedby=\"gallery-5-57105\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/19-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/19-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/19-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-5-57105\" class=\"wp-caption-text gallery-caption\">Admiring the unique beauty of the black sea urchin with its long spines, a common creature on Phu Quoc\u2019s coral reefs.<\/figcaption><\/figure>\n<\/div>\n<p><b>Colorful Starfish:<\/b>\u00a0From orange-red to purple-blue, starfish add vibrant beauty to the seabed. They move silently, resembling multi-petaled flowers, and play important roles in the food chain, controlling populations of other organisms. Starfish can regenerate lost limbs and are good bio-indicators for ecosystem health.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"C_Other_Marine_Creatures\"><\/span><span id=\"C_Other_Marine_Creatures\"><b>C. Other Marine Creatures<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Christmas Tree Worms:<\/b>\u00a0These are marine worms belonging to the polychaete class, with unique shapes resembling miniature Christmas trees. They are filter feeders, living hidden within corals and only revealing their colorful \u201ccrowns\u201d to catch food. Christmas Tree Worms come in vibrant hues like red, pink, blue, orange, yellow, white, and brown, often with multicolored patterns, and fascinatingly,\u00a0<b>no two worms look exactly alike<\/b>, just like snowflakes. They contribute to water filtration and add beauty to the coral reef.<\/p>\n<div id=\"gallery-6\" class=\"gallery galleryid-56680 gallery-columns-3 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/23-2\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/23-3.jpg\" alt=\"Close-up of several bright yellow Christmas tree worms emerging from a brown hard coral colony underwater in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/23-3.jpg\" aria-describedby=\"gallery-6-57141\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/23-3.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/23-3-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/23-3-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-6-57141\" class=\"wp-caption-text gallery-caption\">Vibrant yellow Christmas tree worms, adorning the magical beauty of Phu Quoc\u2019s coral reef.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/attachment\/22\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/22-2.jpg\" alt=\"Close-up of vibrant yellow and orange Christmas tree worms (Spirobranchus giganteus) emerging from a reddish-brown hard coral colony underwater in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/22-2.jpg\" aria-describedby=\"gallery-6-57132\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/22-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/22-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/22-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-6-57132\" class=\"wp-caption-text gallery-caption\">Admiring vibrant Christmas tree worms, a unique marine creature adorning Phu Quoc\u2019s coral reef.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/21-3\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/21-2.jpg\" alt=\"Close-up of numerous vibrant yellow and orange Christmas tree worms emerging from a large brown brain coral colony underwater in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/21-2.jpg\" aria-describedby=\"gallery-6-57123\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/21-2.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/21-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/21-2-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-6-57123\" class=\"wp-caption-text gallery-caption\">Christmas tree worms vibrant like ornaments, illuminating Phu Quoc\u2019s coral reef.<\/figcaption><\/figure>\n<\/div>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/onbird.vn\/the-sea-turtles-of-vietnam-a-rare-encounter-in-phu-quoc-coral-reefs\/\"><strong>Sea turtles:<\/strong><\/a>\u00a0If you\u2019re lucky, you might spot gentle sea turtles gliding through the blue waters. These rare species choose\u00a0<b>Phu Quoc<\/b>\u00a0as their feeding and living grounds, symbolizing the ocean\u2019s tranquility and ancient heritage.https:\/\/www.youtube.com\/watch?v=1Xm9uWfUF-g&amp;t=5s<\/p>\n<p><a href=\"https:\/\/onbird.vn\/jellyfish-season-in-phu-quoc-island-what-you-need-to-bear-in-mind\/\"><strong>Jellyfish:<\/strong><\/a>\u00a0Although sometimes intimidating, jellyfish are a vital part of the marine food chain, with their shimmering, ethereal beauty as they drift in the water. Their seasonal appearance also contributes to the unique character of some sea areas.<\/p>\n<div id=\"gallery-7\" class=\"gallery galleryid-56680 gallery-columns-2 gallery-size-full\">\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/asff\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asff.jpg\" alt=\"A reddish-orange fire jellyfish (Chrysaora sp.) with long, delicate tentacles drifting in purple-blue water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asff.jpg\" aria-describedby=\"gallery-7-57285\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asff.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asff-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asff-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-7-57285\" class=\"wp-caption-text gallery-caption\">Soft fire jellyfish drifting, bringing enchanting and mysterious beauty to Phu Quoc waters.<\/figcaption><\/figure>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon landscape\"><a href=\"https:\/\/onbird.vn\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/asdfc\/#main\"><img loading=\"lazy\" decoding=\"async\" class=\"attachment-full size-full lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asdfc.jpg\" alt=\"Close-up of a pale pink cauliflower jellyfish (Phyllorhiza punctata) with white spots and complex oral arms, drifting in light blue sea water in Phu Quoc.\" width=\"940\" height=\"788\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asdfc.jpg\" aria-describedby=\"gallery-7-57276\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asdfc.jpg 940w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asdfc-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/asdfc-768x644.jpg 768w\" \/><\/a><\/div><figcaption id=\"gallery-7-57276\" class=\"wp-caption-text gallery-caption\">Cauliflower jellyfish with unique patterns, a delicate beauty of Phu Quoc sea.<\/figcaption><\/figure>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Natural_Factors_Influencing_Species_Distribution_in_Phu_Quoc\"><\/span><span id=\"Natural_Factors_Influencing_Species_Distribution_in_Phu_Quoc\"><b>Natural Factors Influencing Species Distribution in Phu Quoc<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The specific biological characteristics of Phu Quoc\u2019s marine ecosystem, including the presence of unique species and the absence of some otherwise common species (like Parrotfish or the rare blue starfish\u00a0<i>Linckia laevigata<\/i>), can be attributed to a combination of specific natural factors:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Unique_Hydrography_and_Water_Environment_of_the_Gulf_of_Thailand\"><\/span><span id=\"1_Unique_Hydrography_and_Water_Environment_of_the_Gulf_of_Thailand\"><b>1. Unique Hydrography and Water Environment of the Gulf of Thailand:<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Phu Quoc is situated deep within the\u00a0<b>Gulf of Thailand<\/b>, a semi-enclosed and relatively shallow sea (average depth of merely 45m). This characteristic leads to\u00a0<b>slower water exchange with the larger ocean (East Sea\/South China Sea)<\/b>.<\/li>\n<li>Consequently, the Gulf of Thailand possesses a\u00a0<b>distinctive hydrological regime and environmental water conditions<\/b>\u00a0compared to other Vietnamese and regional seas. Specifically, the water in the gulf tends to be\u00a0<b>less saline<\/b>\u00a0(lower salinity) due to freshwater inflow from large rivers, and\u00a0<b>richer in sediment<\/b>.<\/li>\n<li>These conditions regarding\u00a0<b>salinity, temperature, water clarity, and nutrient content<\/b>\u00a0have created a unique habitat, only suitable for marine species with high adaptability to these specific factors. This explains why some species common in other marine regions struggle to survive or are notably absent in Phu Quoc.<\/li>\n<\/ul>\n<figure id=\"attachment_57186\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57186\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-57186 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/28-2-716x600.jpg\" alt=\" A diverse coral reef with many small fish swimming, illustrating the rich life in Phu Quoc's unique aquatic environment.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/28-2-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/28-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/28-2-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/28-2.jpg 940w\" \/><figcaption id=\"caption-attachment-57186\" class=\"wp-caption-text\">Diverse coral reefs and fish, a testament to Phu Quoc\u2019s distinctive hydrological environment in the Gulf of Thailand.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"2_Geological_Formation_History_and_Relative_Isolation\"><\/span><span id=\"2_Geological_Formation_History_and_Relative_Isolation\"><b>2. Geological Formation History and Relative Isolation:<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>The Gulf of Thailand region in general, and Phu Quoc Island in particular, were formed by\u00a0<b>tectonic faulting and crustal subsidence<\/b>\u00a0during the Tertiary period. This created a distinct geological structure.<\/li>\n<li>The\u00a0<b>relative isolation<\/b>\u00a0of Phu Quoc from other marine areas throughout its evolutionary history and species distribution also plays a crucial role. Geographical barriers and the gulf\u2019s unique ocean currents have limited the migration and dispersal pathways of some species from other biodiverse regions.<\/li>\n<li>Over time, this has led to the development of\u00a0<b>distinct local marine biological populations<\/b>, perfectly adapted to Phu Quoc\u2019s specific environment, while making it difficult for some otherwise common species to establish and proliferate.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Protecting_Our_Natural_Treasure_%E2%80%93_Our_Collective_Responsibility\"><\/span><span id=\"Protecting_Our_Natural_Treasure_Our_Collective_Responsibility\"><b>Protecting Our Natural Treasure \u2013 Our Collective Responsibility<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>With\u00a0<b>260 coral species<\/b>\u00a0and\u00a0<b>152 reef fish species<\/b>, Phu Quoc\u2019s marine ecosystem is a precious natural treasure shaped by the unique natural factors of the Gulf of Thailand. However, this underwater paradise faces significant pressure from tourism and exploitation. When exploring Phu Quoc\u2019s underwater world, it is crucial to adhere to responsible tourism principles:\u00a0<b>avoid touching corals<\/b>,\u00a0<b>refrain from collecting marine life as souvenirs<\/b>, and\u00a0<b>opt for tours with guides knowledgeable about marine conservation<\/b>.<\/p>\n<figure id=\"attachment_57168\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-57168\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-57168 lazy-load-active\" src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/26-2-716x600.jpg\" alt=\"A freediver gracefully navigates through large yellow and brown coral formations in Phu Quoc's clear waters, embodying responsible exploration and appreciation for natural beauty.\" width=\"716\" height=\"600\" data-src=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/26-2-716x600.jpg\" data-srcset=\"https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/26-2-716x600.jpg 716w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/26-2-768x644.jpg 768w, https:\/\/onbird.vn\/wp-content\/uploads\/2025\/07\/26-2.jpg 940w\" \/><figcaption id=\"caption-attachment-57168\" class=\"wp-caption-text\">Explore the marvelous beauty of Phu Quoc\u2019s ocean, and raise awareness for protecting its natural heritage for future generations.<\/figcaption><\/figure>\n<p>Exploring the wondrous beauty of Phu Quoc\u2019s ocean not only offers unforgettable experiences but also serves as an opportunity for us to deeply understand our responsibility to protect this natural heritage for future generations. Only when each individual is conscious of protection, can this vibrant underwater world truly thrive and develop sustainably.<\/p>\n<p><b>Let each dive be a journey of understanding and love, working with\u00a0<a href=\"https:\/\/www.facebook.com\/onbirdtrip\" target=\"_blank\" rel=\"nofollow noopener\">OnBird \u2013 Soft-Adventer Journeys<\/a>\u00a0to preserve the wonders of Phu Quoc\u2019s ocean for generations to come.<\/b><\/p>\n<div class=\"blog-share text-center\">\n<div class=\"social-icons share-icons share-row relative\"><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The first moment you submerge yourself in Phu Quoc\u2019s azure waters is truly an unforgettable experience. Sunlight filters through the surface, casting shimmering, ethereal rays that illuminate a magnificent scene below \u2013 vibrant coral reefs, akin to a living rock forest beneath the ocean. It\u2019s no coincidence that Phu Quoc is celebrated as one of<a class=\"read-more\" href=\"https:\/\/dtabeam.com\/en\/diving-deep-into-phu-quocs-marine-heart-exploring-the-enchanting-underwater-world\/\">&#8230;[Read More]<\/a><\/p>\n","protected":false},"author":5,"featured_media":1084,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/posts\/1083","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/comments?post=1083"}],"version-history":[{"count":2,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/posts\/1083\/revisions"}],"predecessor-version":[{"id":1251,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/posts\/1083\/revisions\/1251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/media\/1084"}],"wp:attachment":[{"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/media?parent=1083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/categories?post=1083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dtabeam.com\/api\/wp\/v2\/tags?post=1083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}