Flounder

Flounders are a diverse group of flatfish species. They are classified as demersal fish. This term means they live on the bottom of the ocean.

Some of these species also enter estuaries. Estuaries are areas where freshwater meets the sea. Flounders are very important to many global fisheries. They belong to the suborder Pleuronectoidei. This large group includes several different families. These families are Achiropsettidae, Bothidae, Pleuronectidae, Paralichthyidae, and Samaridae. Although they share a name, some flounder species are only distantly related.

One of the most amazing things about flounder is their metamorphosis. This is a process of physical change during growth.

Larval flounder are born with one eye on each side of their head. As they grow from larvae into juveniles, a major change occurs. One eye migrates across the head to the other side of the body. This movement results in both eyes being on the side that faces upward. The specific side the eyes move to depends on the species. This change allows the adult fish to lie flat on the sea floor.

As adults, flounders use specific behaviors to survive. They use camouflage to blend into their surroundings. This helps them hide from predators.

They are ambush hunters. This means they lie still and wait for prey to swim by. They often live in soft, muddy areas of the sea bottom. They also frequent coral reefs, docks, and bridge piles. Their diet consists of several different things. They eat small fish and fish spawn. They also consume crustaceans and polychaetes.

There are many different types of flounder found around the world. In the Western Atlantic, you can find the Gulf flounder and the Southern flounder. The Summer flounder is also known as a fluke.

In European waters, there is the European flounder and the Witch flounder. The North Pacific is home to the North Pacific Halibut. Another type is the Olive flounder. Some species, like the Flowery flounder, live in places like Hawaii.

In New York, a company called Mariculture Technologies farms fluke in open water.

Flounder vary in size and appearance. They typically grow to a certain length, though the specific measurement is not listed. Their width is usually about half of their total length. Some fish show interesting physical traits due to their environment. For example, male Platichthys have been found near northern Sardinia. These specific fish sometimes have heavy encrustations of barnacles on them. These are small sea creatures that attach themselves to hard surfaces.

We must also consider the health of flounder populations. In 2003, researchers estimated that large ground fish stocks were very low. This included both sole and flounder. These stocks were only about 10% of what they were before industrial fishing began. This decline is largely due to overfishing by the fishing industry. Today, there are approximately 30 million flounder alive in the world. This estimate does not include sole.

Some areas face even greater challenges. In the Gulf of Mexico, along the Texas coast, populations may be struggling. Research indicates the flounder population there could be as low as 15 million. This low number is caused by two main factors. The first is heavy overfishing. The second is industrial pollution. Protecting these fish is important for the ocean ecosystem. Understanding their life cycles and habitats helps us manage these populations better.