10 Endangered Ocean Species and Marine Animals

Our eco-system is comprised of interdependent animals and plants which constitute a complex web of life. This variety of life on earth, the biodiversity that features numerous interactions among the species, is most vital to the existence of our planet and, particularly, of humanity. Thus, indeed the extinction of a single species may affect the whole biological system pertaining to life and living things.

Unfortunately, the improper interventions of human beings in nature are pushing several of the species in the ecosystem to the brink of extinction.

The unprecedented unnatural extinction of these species has not only the endangered functioning of the ecosystem but also affected the ecological issues to a large extent.

From unknown creatures to Charismatic megafauna, these disappearances in the ecosystem happen frequently. On land, animals like Orangutan, Black Rhinos, Amur Leopard and Giant Pandas are some of the most critically endangered species in the world.

Similarly, many marine species including marine mammals, sea turtles and salmonids are also on the edge of extinction as climate change and overfishing become a major threat to their existence.

According to the International Union for Conservation of Nature (IUCN), hundreds of marine species across the world come under the categories of endangered and critically endangered species.

IUCN, at regular intervals, determines the status of species considering the probability of their extinction, from least concern to extinct. Some of these majorly endangered and recognizable marine species are named here.

Let’s take a look at ten endangered ocean species and marine animals.


1. Hawksbill Turtle (Eretmochelys imbricate)

Found in the tropical regions of all the world’s oceans, gulfs and seas- mostly in coral reefs, the Hawksbill Turtle’s population has been estimated to have declined by 80% over the last century.

Known to be a subject of heavy trafficking in the tourist trade in tropical regions for its meat and shells, these turtles are being killed mercilessly for quite a period of time.

The colourful shells of the Hawksbill Turtle, with beautiful patterns, make them a valuable item in the market, often sold as “tortoiseshell.”

Hawksbill Turtle
Image for representation purpose only

Even though in many countries harvesting of its eggs is banned, the practice could not be ceased completely. The declination of its population has also resulted due to the degradation of coral reef species which the Hawksbill Turtle primarily feed on.

According to marine conservatives, this family of the turtle is the living representatives of reptiles that have existed in our oceans for the past hundred million years and these turtles are vital for the existence of seagrass beds and coral reefs.

2. Vaquita (Phoeocna sinus)

An inhabitant of the shallow, murky waters off the shore of the Baja Peninsula in Mexico, Vaquita is the world’s smallest and critically endangered cetacean.

This rare marine mammal in the world is on the brink of extinction only after a half-century of its first sighting. Features of Vaquita include the dark rings around their eyes, lips with dark patches and a thin line from mouth to dorsal fins.

Image for representation purpose only

Extensive use of gill-netting for fishing in the Gulf of California has endangered this marine species, resulting in a gradual drop in population since the 1940s.

The gill-netting operation may have been ceased to exist in 1970, but the population fall persists for as much as 15% every year.

According to reports, there is only a dozen of this marine mammal left in the world since the percentage of decline in their population was as much as 90% since 2011.

Watch Vaquita video here. 

3. Blue Whale (Balaenopteramusculus)

The largest living mammal on earth, the blue whale belongs to the baleen whales and features more than 100 feet in length and around 200 tonnes in weight.

There are at least three subspecies of Blue whale and these could be found migrating from both poles in the oceans around the world. Sits on top of the food chain, whales have a significant role in maintaining a healthy marine environment.

Blue Whale
Image for representation purpose only

Unfortunately, excessive commercial hunting has resulted in a decrease in its population drastically and now has posed a threat to its mere existence even though an international ban was constituted in 1966. According to IUCN’s 2016 estimate, the global population of the Blue Whale is 10,000–25,000.

Watch blue whale video here.

4. Kemp’s Ridley Sea Turtle (Lepidochelys kempii)

The Kemp’s Ridley sea turtle, also known as the Atlantic Ridley sea turtle, is a rarest and smallest sea turtle and is endangered to a severe degree.

Primarily found in the Gulf of Mexico, the Kemp’s Ridley sea turtle often migrate to the Atlantic Ocean only to come back to lay eggs. This group turtle has a unique way of nesting habits. The female turtles arrive in large numbers- a procession called Arribadas- in a single beach to lay eggs.

Kemp’s Ridley Sea Turtle
Image for representation purpose only

Unfortunately, the conditions such as loss of habitat, marine pollution and entanglement in fishing nets etc. have resulted in the huge decline of the population of the Kemp’s Ridley sea turtle.

Thus, harvesting of eggs have been made illegal and research projects of incubating and hatching the eggs in temperature-controlled rooms have been undertaken to save this endangered marine species.

Watch the video of Kemp Ridley Sea Turtle here.

5. Steller Sea Lion (Eumetopiasjubatus)

Evidently the largest member of the Otariid family and the fourth largest of all seal species, this eared seal could be located in the cold coastal waters of the North Pacific. Also known as the northern sea lion, the species is named after Georg Wilhelm Steller, a naturalist who first discovered them in 1741.

Steller Sea Lion
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The high risk of predation by Killer Whales and fishing and harvest by native Alaskans and Canadians for meat, oil, hides and other by-products make this marine life vulnerable to endanger.

According to reports, its population has declined by more than 60% due to both natural and human threats since the 1960s. However, the eastern Steller sea lion was omitted from the U.S. Endangered Species List in 2013 after their increasing population in recent years.

Watch video of Steller Sea Lions here.

6. Hammerhead Shark (Sphyrna mokarran)

Traced in the tropical regions of the oceans around the world, the Hammerhead shark belongs to the family Sphyrnidae and was given the name because of its “hammer” shaped head.

The Hammerhead sharks typically have 0.9 to 6.0 m length and up to 580 kg weight. Known as aggressive hunters, these sharks are feed on smaller fish, squid crustaceans and octopuses, while there are reports of unprovoked attacks on humans by the shark.

Hammerhead Shark
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These migratory sharks are subjected to being victimized for its fin. Even the process itself is horrifying as the sharks are caught by fishermen, dragged on board and is cut off their fins while they are still breathing.

The remaining carcass is thrown into the water and eventually, it bleeds to death. Albeit there is a ban imposed upon shark finning in many countries, the result has been abortive as the demand and high price paid for it in the Asian market drives the illegal harvest system, endangering these marine species’ survival.

7. Fin whale (Balaenopteraphysalus)

Also known as common rorqual, Fin whale is the second-largest mammal on the planet after Blue Whale. With a maximum length of 25.9 meters, the Fin Whale has an estimated weight of about 114 tonnes. Like all the other whales in our oceans, the Fin Whale is also a victim of hunting for a long period of time. According to estimates, the global population of Fin Whale ranges from below 100,000 to around 119,000.

Fin whale
Image for representation purpose only

Humpback Whale, another rorqual species, has also been listed as an endangered marine species. Before the introduction of whaling moratorium in 1966, these species were hunted to extinction for its fur and flesh for meat, while the population dropped by 90%. Currently, around 2,500 Humpback Whale is believed to surviving in the world.

8. Hector’s Dolphin (Cephalorhynchushectori)

Found off the coast of New Zealand, Hector’s Dolphins are the smallest dolphins in the world and the prominent dolphin in the genus Cephalorhynchus. Mostly sighted around the South Island, the world’s rarest dolphins’ features include black markings on the face, stocky bodies and creamy white throat and belly. One group of Hector’s Dolphin will be comprised of two to eight members.

Hector's Dolphin
Image for representation purpose only

Unfortunately, there is a significant decline in their population as trawl fisheries and bottom-set gill nets cause the death of these species. Most number of deaths happens in the fishing nets. One of the two sub-species of Hector’s Dolphin, Maui’s dolphin, is considered to be a most endangered one. According to the survey conducted by the New Zealand Department of Conservation in 2010-11, the estimated population of these dolphins is 55.

9. Hawaiian Monk Seal (Monachusschauinslandi)

A native of the Northwestern Hawaiian Islands, Hawaiian Monk Seal is one of the earless seals who live in the warm beaches, unlike other seals.

This endangered marine mammal is one of the two remaining in this species-monk seal- along with the Mediterranean monk seal, while third species from this family, the Caribbean monk seal, has already disappeared from the planet.

Hawaiian Monk Seal
Image for representation purpose only

According to the recent research, there are only around 1,400 Hawaiian Monk Seal remaining on the Islands now. The existence of these seals is threatened by commercial hunting for meat, oil and skin, attack from predators including tiger sharks, marine debris and entanglement in fishing nets.

10. Green sea turtle (Cheloniamydas)

One of the largest sea turtles, Green Sea Turtle is a herbivore and can be found in the tropical and subtropical seas. The Green Sea Turtle’s name comes from the colour of the fat that found underneath its carapace. Like many other turtle varieties, Green Sea Turtles also migrate from its hatching beaches to feeding grounds.

Since these sea turtles are always been a popular food item, the hunt for turtles and their eggs is threatening their lives. The loss of sandy beaches, marine population and careless fishing methods also have added to the decline of their population.

Green sea turtle
Image for representation purpose only

Apart from these mammals and turtles, salmonids and seabirds also have confronted the menace of endangered ocean species. The Maritime Mammal Protection Act (MMPA-1972) and The Endangered Species Act (ESA-1973) have contributed so far to salvage this ocean life but it requires adequate awareness about these issues and the transcendence of the human behaviour in accordance to that, which can inevitably make a difference for these ocean endangered species.

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Disclaimer: The views mentioned above are of the author only. Data and charts, if used, in the article have been sourced from available information and have not been authenticated by any statutory authority. The author and Marine Insight do not claim it to be accurate nor accept any responsibility for the same. The views constitute only the opinions and do not constitute any guidelines or recommendation on any course of action to be followed by the reader.

The article or images cannot be reproduced, copied, shared or used in any form without the permission of the author and Marine Insight. 


  1. Humpback whale numbers are not as low as reported; between Hawaii and Alaska alone they number near 11,000, and they are also of least concern on the IUCN Red List. Not mentioned are the critically endangered Maui’s dolphin of New Zealand.

  2. we need to help the humpback whales by stop fishing or take care of what you do with fishing gear leave humpback whales alone !
    we need to look after humpback whales !!!!!!

  3. Friend me on Facebook. LOL
    I just read this because i was doing a project for school and i saw this i found this very surprising.

  4. we will help with those andanger mammals cuz they will need it even if i have to do chertie work for them cuz they need

  5. Save the sea life!!!
    doing an project totally into saving sea life!!
    hopefully they have more to look forward to
    more than extinction.

  6. I’m sad about these animals and I want to raise money for these animals.

  7. Help save our planet!!!! Do not over fish, don’t pollute our water streams, and keep our marine life alive!!!!

  8. I had to do an essay on MARINE endangered animals not just endangered animals. So I have to start my whole essay again. >:(

  9. i was just surfing the web for a school project and when i saw this i was so shocked! what they are doing ti the hammerhead sharks is not fair!!!!

  10. This sounds like the work of an american made nuclear power plant that blew up in Japan not that it’s due to over fishing. We have been over fishing for generations….. Wake up wwf…

  11. Wow i find this so cool guys we have to save our oceans because if we don’t do something now then our plastic in seas and polluted rivers is gonna have an effect on the earth!

  12. OMG! I love this slide! It was super helpful. Also, sub to Mr. derp melon and Pewdiepie!!!!!!

  13. LETS SAVE THESE ANIMALS!!!! don’t post things like Hi talk about what we really need to do HELP THESE POOR THINGS!!!!

  14. if only people understood what a difference a small gesture makes. we can help save these animals if we stop littering and start picking up the litter!

  15. Fisherman are monsters!! We have to save these poor animals! There are more endangered animals and this is just some of them and there is so many animals in this world, that we don’t need anymore lost like the dinosaurs. We still have dinosaurs today; the turtle. I have studied this article, it has helped a lot, thank you so much

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