{"id":29652,"date":"2024-03-06T12:11:46","date_gmt":"2024-03-06T17:11:46","guid":{"rendered":"https:\/\/oceana.org\/?p=29652"},"modified":"2025-03-24T07:12:53","modified_gmt":"2025-03-24T11:12:53","slug":"animals-of-the-ocean-depths","status":"publish","type":"post","link":"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/","title":{"rendered":"Animals of the ocean depths"},"content":{"rendered":"\n

The ocean is vast and largely unexplored, leading people to think of it as a mysterious place where action only occurs at the surface and deep-sea creatures are few and far between. However, the reality is that there\u2019s another dimension that is crucial for the flora and fauna that brings the ocean to life: depth.<\/p>\n\n\n\n

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Blue glaucus Shutterstock\/Sahara Frost<\/figcaption><\/figure><\/div>\n\n\n

Most fish, plants, mammals, and other marine organisms live near the surface, while a smaller number of species are distributed towards the deeper depths, where there\u2019s less sunlight. Thus, the same sea can host dramatically different species depending on its depth \u2014 from sea turtles who stay near the surface and nest on beaches to deep-sea creatures like seapigs and sea spiders.<\/p>\n\n\n\n

For example, fish near the surface can use their eyesight and striking colors to find a mate and hunt. The clear visibility near the surface also requires species to camouflage and hide from predators. Some use a technique known as countershading<\/a>, like the blue glaucus (Glaucus atlanticus<\/em>)<\/a>. \u00a0
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Fish in the dark depths must resort to different tactics. Deep sea creatures use adaptations like self-generated light (bioluminescence<\/a>), enhanced senses, enlarged eyes, and special colorations. For example, species that are red are virtually invisible to predators in the deep sea since red light cannot reach these depths.\u00a0<\/p>\n\n\n\n

To get a better idea of \u200b\u200bhow depth influences ocean life, here are some species that inhabit the four major depth zones: the sunlight zone, twilight zone, midnight zone, and abyssal zone.\u00a0\u00a0<\/p>\n\n\n\n

Sunlight Zone<\/strong>\u00a0<\/h2>\n\n\n\n

The sunlight zone is between 1 and 200 meters (660 feet) deep. Most marine life is concentrated in coastal areas and in the most superficial layers of the oceans where, thanks to the entry of sunlight, algae and marine plants can photosynthesize, generating vital support for the base of the food chain.\u202fThese brighter marine places are known as the epipelagic zone, or sunlight zone. Some animals that inhabit this zone include:\u00a0\u00a0<\/p>\n\n\n\n

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Great white shark (Carcharodon carcharias<\/em>)<\/strong><\/a>\u00a0<\/h3>\n\n\n\n

This shark is one of the largest sharks in the world behind the whale shark<\/a> and basking shark<\/a>. Although it\u2019s also suited for cold water, it prefers warmer temperate seas. Unlike most fish, it is a warm-blooded animal, which allows it to be a more active predator in cooler waters compared to cold-blooded species.  <\/p>\n<\/div>

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\u00a9 Shutterstock\/wildest animal<\/p>\n\n\n\n

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Red comb star\u202f(Astropecten aranciacus<\/em>)<\/strong>\u00a0<\/h3>\n\n\n\n

These echinoderms feed mainly on slow moving or sessile prey, including bivalves. Rather than using eyesight, they detect prey from waterborne odors by using chemosensory receptors. They are most commonly found in the subtidal zones of the Aegean and Mediterranean Sea. <\/p>\n<\/div><\/div>\n\n\n\n

\u00a9 Oceana\/Juan Cuetos<\/p>\n\n\n\n

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Loggerhead sea turtle (Caretta caretta<\/em>)<\/strong><\/a> <\/h3>\n\n\n\n

This turtle\u2019s paddle-shaped fins allow them to elegantly glide through the water. These sea turtles can remain underwater for several hours without having to surface to breathe. They migrate thousands of kilometers until they return to their nesting beaches to lay their eggs.<\/p>\n<\/div>

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\u00a9 Oceana\/Carlos Minguell<\/p>\n\n\n\n

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Spotted porcupinefish\u202f(Diodon hystrix<\/em>)<\/strong><\/a> <\/h3>\n\n\n\n

To protect itself from its predators, this fish inflates itself like a balloon by swallowing water and straightening its spines.\u202fIts beaked mouth allows it to break the hard shell of mollusks and crustaceans. They are generally found in holes and crevices of coastal areas like lagoons, caves, shipwrecks, and reefs. <\/p>\n<\/div><\/div>\n\n\n\n

\u00a9 NOAA<\/p>\n\n\n\n

<\/div>\n\n\n\n

Twilight Zone<\/strong>\u00a0\u00a0<\/h2>\n\n\n\n

The twilight zone is between 200 and 1,000 meters (650 to 3,300 feet) deep. At greater depths the light becomes dimmer, creating what is known as the mesopelagic zone or twilight zone.\u202fWith a lack of solar energy, animals in these places must develop other strategies to survive and adapt to the low light, increasing atmospheric pressure, and low temperatures. Marine life that can be found in the twilight zone include:\u00a0\u00a0<\/p>\n\n\n\n

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Sperm whale \u00a9 Shutterstock\/wildestanimal<\/figcaption><\/figure>\n\n\n\n
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Common octopus \u00a9 Oceana\/Juan Cuetos<\/figcaption><\/figure>\n\n\n\n
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Mauve stinger \u00a9 Oceana\/Carlos Minguell<\/figcaption><\/figure>\n<\/figure>\n\n\n\n
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Sperm whale\u202f(Physeter macrocephalus<\/em>)<\/strong><\/a> <\/h3>\n\n\n\n

These whales spend most of their time descending to depths of 2,000 feet to hunt for food. They are capable of diving to even deeper depths (over 10,000 feet) for over an hour. At these depths they feed on squid, sharks, skates, and fish.<\/p>\n\n\n\n

Common octopus (<\/strong>Octopus vulgaris<\/em><\/strong>) <\/strong> <\/h3>\n\n\n\n

All cephalopods, like these octopuses, have tentacles with suction cups.\u202fThe octopus uses them to glide along the ocean floor, feel, touch, and capture its prey.\u202fIt is one of the most intelligent marine animals, with the ability to modify its color and appearance to camouflage itself.<\/p>\n\n\n\n

The mauve stinger (<\/strong>Pelagia noctiluca<\/em><\/strong>)<\/strong> <\/h3>\n\n\n\n

Like many types of jellyfish, the mauve stinger has long tentacles full of stingers that act as a defense mechanism and to capture their prey. The stingers cause severe hives6<\/sup> if humans come into contact with them.\u202f95% of their body is made up of water and they travel through the seas by letting themselves be carried by the currents. <\/p>\n\n\n\n

<\/div>\n\n\n\n

Midnight Zone <\/strong><\/h2>\n\n\n\n

The midnight zone is between 1,000 and 4,000 meters (3,300 – 13,100 feet) deep.<\/p>\n\n\n\n

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A deep sea angler fish, specifically Bufoceratias wedli<\/em>. \u00a9 Wikimedia \/ Masaki Miya et al.<\/figcaption><\/figure><\/div>\n\n\n

The bathypelagic or midnight zone can reach depths of 4,000 meters (13,100 feet).\u202fOrganisms in this zone live in complete darkness. Many creatures have developed adaptations to generate their own light, called bioluminescence, to attract prey or to find a mate.\u202fSome species have lost their ability to see anything at all. <\/p>\n\n\n\n

Deep sea anglerfish<\/strong><\/a> <\/h3>\n\n\n\n

There are more than 200 species of deep-sea anglerfish. The diverse range of anglerfish species in the deep-sea have adapted with features including male dwarfism, bioluminescent lures to capture prey, and unique reproductive modes like male sexual parasitism<\/a> – where males attach to the female deep-sea anglerfish as their mating strategy.<\/p>\n\n\n\n

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Sloane\u2019s viperfish\u202f(Chaliodus macouni<\/em>) <\/strong><\/h3>\n\n\n\n

These fish are mainly found at depths ranging from 200 to 4,000 meters (656 to 13,123 feet). Their light-producing organs called photophores along their belly mask the fish\u2019s silhouette from predators below and can be used to attract prey. Their lower fangs are so large that it must dislocate its jaw to swallow its prey and its first vertebra has evolved to act as a shock absorber for their powerful bite.<\/p>\n<\/div><\/div>\n\n\n\n

\u00a9 Oceana<\/p>\n\n\n\n

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Pelican eel (Eurypharynx pelecanoides<\/em>)<\/strong> <\/h3>\n\n\n\n

This strange eel-like fish engulfs its prey with its huge mouth.\u202fIt can expand its throat and stomach to swallow large fish and crustaceans.\u202fThey have many, many teeth in their jaw and the end of their tail flashes pink or red through bioluminescence.<\/p>\n<\/div>

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\u00a9 Wikimedia<\/p>\n\n\n\n

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Abyssal Zone <\/strong><\/h2>\n\n\n\n

4,000 \u2013 6,000 meters (13,000 \u2013 20,000 feet) <\/h3>\n\n\n\n

The abyssal zone is between 4,000 \u2013 6,000 meters (13,000 \u2013 20,000 feet) deep. In the abyssal plains, unique forms of life develop. Animals that live in this deep-sea zone include basket stars, seapigs, and seaspiders. Some crustaceans living at these depths have evolved without eyes, since they must rely on other senses to survive due to the absence of sunlight. Species can survive thanks to the \u201crain\u201d of organisms and organic matter that sink from the most superficial layers. \u00a0
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Additionally, there are bacteria that, due to the lack of sunlight, carry out chemosynthesis (they obtain energy from chemical substances).\u202fThe species found here live in icy-cold waters, with atmospheric pressure that would crush most animals on the planet \u2013 including humans.\u202f\u00a0\u00a0<\/p>\n\n\n\n

Deeper Zones<\/h2>\n\n\n\n

Deeper is the hadal<\/strong> or hadopelagic zone<\/strong>, <\/em>with depths from 6,000 meters (20,000 feet) down, which are generally ocean trenches.  <\/p>\n\n\n\n

The deepest known place in the ocean measures 10,935 meters (35,876 feet), which is found in the Pacific Ocean\u2019s Mariana Trench, also known as \u201cChallenger Deep<\/a>\u201d. The challenging, merciless environment of the ocean depths makes scientific exploration extremely difficult.  <\/p>\n\n\n\n

The ocean is home to all kinds of life, from the abundance of sea animals who thrive in the sunlight zone, all the way down to the yet-to-be-discovered deep-sea animals living at ocean depths that are too difficult for exploration. Deep ocean animals have adapted to thrive in habitats without light and warmth, under crushing atmospheric pressures.<\/p>\n\n\n\n

  <\/p>\n","protected":false},"excerpt":{"rendered":"

The ocean is vast and largely unexplored, leading people to think of it as a mysterious place where action only occurs at the surface and deep-sea creatures are few and far between. However, the reality is that there\u2019s another dimension that is crucial for the flora and fauna that brings the ocean to life: depth. … Read more<\/a><\/p>\n","protected":false},"author":576,"featured_media":12390,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"location":[],"expedition":[],"campaign":[197],"ppma_author":[375],"class_list":["post-29652","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","campaign-marine-wildlife","infinite-scroll-item"],"acf":[],"yoast_head":"\nOcean Life: Surface Animals to Deep Sea Creatures | Oceana<\/title>\n<meta name=\"description\" content=\"Learn about the oceans 4 main depth zones, which are home to amazing species - from animals near the surface to deep sea creatures.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Animals of the ocean depths\" \/>\n<meta property=\"og:description\" content=\"Learn about the oceans 4 main depth zones, which are home to amazing species - from animals near the surface to deep sea creatures.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\" \/>\n<meta property=\"og:site_name\" content=\"Oceana\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/oceana\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-06T17:11:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-24T11:12:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/oceana.org\/wp-content\/uploads\/sites\/18\/homepage_hero_turtle_0-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1611\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Kailie Scott\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Oceana\" \/>\n<meta name=\"twitter:site\" content=\"@Oceana\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kailie Scott\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\"},\"author\":{\"name\":\"Kailie Scott\",\"@id\":\"https:\/\/oceana.org\/#\/schema\/person\/ff284b9306803ea5e334650614254218\"},\"headline\":\"Animals of the ocean depths\",\"datePublished\":\"2024-03-06T17:11:46+00:00\",\"dateModified\":\"2025-03-24T11:12:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\"},\"wordCount\":1296,\"publisher\":{\"@id\":\"https:\/\/oceana.org\/#organization\"},\"image\":{\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/oceana.org\/wp-content\/uploads\/sites\/18\/homepage_hero_turtle_0-scaled.jpg\",\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\",\"url\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/\",\"name\":\"Ocean Life: Surface Animals to Deep Sea Creatures | Oceana\",\"isPartOf\":{\"@id\":\"https:\/\/oceana.org\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/oceana.org\/blog\/animals-of-the-ocean-depths\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/oceana.org\/wp-content\/uploads\/sites\/18\/homepage_hero_turtle_0-scaled.jpg\",\"datePublished\":\"2024-03-06T17:11:46+00:00\",\"dateModified\":\"2025-03-24T11:12:53+00:00\",\"description\":\"Learn about the oceans 4 main depth zones, which are home to amazing species - 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