Eel

Eel (/iːl/), from the Old English ǣl, is a term used to describe over 800 species of fish, most of which belong to the family Anguillidae. Eels are elongated fish, ranging in length from 5 cm to 4 m, depending on the species.

Etymology

The term "eel" originates from the Old English word ǣl. It is related to the Dutch word aal and the German word Aal, both of which also mean "eel".

Anatomy

Eels are characterized by their elongated bodies and lack of pelvic fins. They have dorsal and anal fins that are usually continuous and extend almost the entire length of the body. The skin of eels is often covered in a layer of mucus, which can make them appear to be slimy.

Life Cycle

The life cycle of an eel is complex and involves several stages. Most eels are catadromous, meaning they live in fresh water and migrate to the sea to breed. The eggs hatch into larvae, which drift back to fresh water to grow and mature.

Species

There are numerous species of eels, including the European eel (Anguilla anguilla), the American eel (Anguilla rostrata), and the Japanese eel (Anguilla japonica). Each species has its own unique characteristics and habitat preferences.

Uses

Eels are used in a variety of ways by humans. They are a popular food in many cultures, particularly in East Asia and Europe. Eels are also used in scientific research due to their complex life cycle and unique physiology.

Related Terms

Anguillidae: The family of fish to which most eel species belong.
Catadromous: Describes fish that live in fresh water and migrate to the sea to breed.
Larvae: The immature form of an animal that undergoes metamorphosis.

External links

Medical encyclopedia article on Eel
Wikipedia's article - Eel

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Eel

Eel