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True eel

Eels
Temporal range: Cretaceous–Recent
Anguillarostratakils.jpg
American eel (Anguilla rostrata)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Superorder: Elopomorpha
Order: Anguilliformes
L. S. Berg, 1943
Suborders

Anguilloidei
Congroidei
Nemichthyoidei
Synaphobranchoidei

This article is
one of a series on
Commercial fish
Blue walleye.jpg
Large pelagic
billfish, bonito
mackerel, salmon
shark, tuna

Forage
anchovy, herring
menhaden, sardine
shad, sprat

Demersal
cod, eel, flatfish
pollock, ray
Mixed
carp, tilapia

Anguilloidei
Congroidei
Nemichthyoidei
Synaphobranchoidei

An eel is any fish belonging to the order Anguilliformes (/æŋˌɡwɪlˈfɔːrmz/), which consists of four suborders, 20 families, 111 genera and about 800 species. Most eels are predators. The term "eel" (originally referring to the European eel) is also used for some other similarly shaped fish, such as electric eels and spiny eels, but these are not members of the Anguilliformes order.

Eels are elongated fish, ranging in length from 5 cm (2.0 in) in the one-jawed eel (Monognathus ahlstromi) to 4 m (13 ft) in the slender giant moray. Adults range in weight from 30 g (1.1 oz) to well over 25 kg (55 lb). They possess no pelvic fins, and many species also lack pectoral fins. The dorsal and anal fins are fused with the caudal fin, forming a single ribbon running along much of the length of the animal. Eels swim by generating body waves which travel the length of their bodies. They can swim backwards by reversing the direction of the wave.


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Wikipedia

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