West Indian Ocean coelacanth

A special blue fish lives in the sea.

It has bright blue skin with spots. These spots help it hide while it hunts.

This fish has very large eyes. Big eyes help it see in dark water. It likes to hide in deep caves during the day. At night, it swims out to find food. This fish is very rare to find. We must work hard to help them stay safe.

The West Indian Ocean coelacanth is a rare fish.

People thought these fish were gone forever. Scientists only knew them from old fossils. Then, a captain found one in 1938. He found it near South Africa. This fish is a royal blue color. It has spots to help it hide.

These spots act as camouflage. This helps the fish hunt for prey. The coelacanth has very large eyes. It also has a special layer in its eyes. This layer reflects light to help it see in the dark. Most of these fish live in deep underwater caves. They hide in caves during the day. At night, they swim out to find food. They eat other fish. The coelacanth can move its upper and lower jaws. This helps it slurp up food from small cracks. These fish are in danger of dying out. We call this being critically endangered. There may be 500 or fewer left in the wild.

The West Indian Ocean coelacanth is a very rare fish. It is a special kind of vertebrate. It is more closely related to lungfish than to common fish. This fish is also called the gombessa. Some people call it the African coelacanth. It is a famous animal because it was once thought to be extinct. Scientists only knew about them from fossils until recently. Now, we know they are still swimming in the ocean. This makes them a very important subject for study.

This fish has a unique way of living and eating.

They have a deep royal blue color with spots. These spots help them hide while they hunt. They live in deep water between 70 and 140 meters. Many stay in underwater lava caves during the day. This keeps them safe from predators. At night, they swim out to find food. They can even do headstands to slurp prey from cracks. This works because they can move both their upper and lower jaws.

A big discovery happened in South Africa in 1938.

A captain named Hendrik Goosen caught a strange fish. He called Marjorie Courtenay-Latimer to show her the catch. She could not find the fish in her books. She asked a scientist named J. L. B. Smith for help. Smith recognized the fish right away. He knew it was a coelacanth from the fossils. He named the species Latimeria chalumnae to honor her and the water.

There are many specific facts about these amazing creatures. Males can grow up to 1.16 meters long. Females can grow even larger. They have large eyes to see in the dark. They also have a special layer in their eyes to reflect light. In 2013, scientists even mapped their entire genome. This helped them learn how they are related to land animals. They also have a long gestation period of about 12 months. This means the babies stay inside the mother for a long time.

Today, these fish face a very hard job to survive. They are listed as critically endangered. This means they are at a high risk of dying out. In 1998, experts thought there were 500 or fewer left. They live in small groups around the western Indian Ocean. This includes places like Madagascar and the Comoros Islands. Some fish are caught by accident each year. Because they are so rare, international laws now protect them. We must be careful to help them stay in our oceans.

The West Indian Ocean coelacanth, known scientifically as Latimeria chalumnae, is a rare and remarkable vertebrate.

It belongs to a unique order of fish that is more closely related to lungfish and land-dwelling tetrapods than to common ray-finned fishes. Often called the gombessa or the African coelacanth, this species is a subject of intense scientific interest. For a long time, people believed these animals were extinct. They only knew of their existence through ancient fossils. The discovery of living specimens changed our understanding of evolutionary history. Today, the species is considered critically endangered by the IUCN Red List.

Physically, the coelacanth is built for life in the deep, dark ocean.

Males can reach a length of 1.16 meters, while females grow even larger. They possess a deep royal blue color covered in spots. This pattern acts as camouflage to help them hunt prey. To see in the dim light of the deep sea, they have large eyes. They also possess a choroidal tapetum lucidum. This is a special layer that reflects light through the retina. This mechanism increases the amount of light their visual pigments can absorb. They also have many rods, which are cells that help with vision in low light.

One of the most unusual features of the coelacanth is how it eats.

Most vertebrates with bone skeletons can only move their lower jaws. However, the coelacanth can move both its upper and lower jaws. This is possible because of an intracranial joint and associated muscles. This unique anatomy allows them to perform "headstands." During a headstand, they can slurp prey directly out of narrow crevices in underwater caves. They are opportunistic hunters that eat various fish species. Some of their known prey include Amioides polyacanthus and Beryx splendens.

These fish live in specific environments within the western Indian Ocean. They are typically found at depths between 70 and 140 meters. However, they have been spotted as shallow as 30 meters and as deep as 200 meters. They often reside in underwater lava caves during the daytime. These caves provide protection from predators. At night, they move into the surrounding feeding grounds. To manage their internal chemistry, they use a process called osmoregulation. They do this by retaining urea in their blood to balance osmotic pressure. They are also ovoviviparous, meaning they keep their eggs inside their bodies until they hatch. This results in a long gestation period of about 12 months.

The modern history of the coelacanth began with a surprising discovery in 1938. Captain Hendrik Goosen of the trawler Nerine caught a strange fish near South Africa. He contacted Marjorie Courtenay-Latimer, a museum curator, to examine the catch. She could not identify the fish using her books. She reached out to Professor J. L. B. Smith for assistance. Smith recognized the specimen as a coelacanth from the fossil record. He named the species Latimeria chalumnae to honor Courtenay-Latimer and the waters where it was found. A second specimen was later captured in 1952 near the Comoros Islands. This second fish helped scientists study the animal's internal organs and muscles more closely.

Recent scientific advances have provided even more detail about this species. In 2013, researchers successfully sequenced the genome of Latimeria chalumnae.

This genetic work was intended to help scientists understand how tetrapods evolved. For a long time, scientists thought coelacanths were the closest relatives to the first land animals. However, the genetic sequencing proved that lungfishes are actually the closest relatives to land tetrapods. This discovery changed how biologists view the evolutionary tree. It showed that morphological similarities can sometimes be misleading compared to genetic data.

Despite their ancient history, the survival of the coelacanth is currently at risk. The population is widely but very sparsely distributed. They live in small colonies along the rim of the western Indian Ocean. This includes the coasts of South Africa, Tanzania, Kenya, the Comoros, and Madagascar. In 1991, it was estimated that only 1% of the population near Grand Comoro was accidentally caught each year. Between 1991 and 1994, the total population saw a reduction of about 30%. By 1998, the total population was estimated to be 500 individuals or fewer. Because of these threats, the species is protected by the CITES treaty. This treaty regulates all international trade to prevent the species from going extinct.