Freshwater

Climbing perch

Anabas testudineus

The body is slightly elongated, with straight back and sides, the head is rather large. It …

Common bleak

Alburnus alburnus

The body of the common bleak is elongated, strongly compressed laterally, with an almost straight dorsal …

Common nase

Chondrostoma nasus

A swift river fish with a unique mouth structure, known for its schooling behavior and specific …

Constancia’s seasonal killifish

Cynolebias constanciae

The body of Constancia's seasonal killifish (Cynolebias constanciae) is elongate and slightly laterally compressed.

Crappie, Black

Pomoxis nigromaculatus

The black crappie and white crappie are similar in colour, ranging from silvery olive to bronze …

Crappie, White

Pomoxis annularus

White crappie and black crappie are the same colour, ranging from silvery olive to bronze with …

Dace

Rhinichthys cataractae

Dace have a slender body. Most species have terminal antennae. The pearl dace (Semotilus margarita margarita) …

Dace, Blacknose

Rhinichthys atratulus

The blacknose dace has a long, slender body with a slightly protruding snout. The whiskers, characteristic …

Dace, Longnose

Rhinichthys cataractae

The longnose dace is a distinctive minnow with a long, fleshy snout, a subterranean mouth and …

Darters: Johnny Darter

Etheostoma nigrum

There are three known genera of darters: Percina, which contains about 40 species: Etheostoma, which contains …

Dolly Varden trout

Salvelinus malma

The body of the Dolly Varden trout is elongated, somewhat rounded, with the greatest depth of …

Dolly Varden, Bull Trout

Salvelinus malma, Salvelinus confluentus

These two char species, as well as Arctic char, are difficult to distinguish by appearance alone, …

Drum, Freshwater

Aplodinotus grunniens

The body is deep, with a crooked back, a blunt snout and a subterranean mouth adapted …

Drum, Red

Sciaenops ocellatus

The red drum is similar in appearance to the black drum, although its maximum size is …

Eastern bottle-nosed mormyrid

Mormyrus longirostris

The eastern bottle-nosed mormyrid has such a distinctive appearance that it cannot be confused with any …

Eastern mosquitofish

Gambusia holbrooki

The body of the Eastern mosquitofish is moderately elongated, not tall, and laterally compressed. It is …

Eel, American

Anguilla rostrata

The body is elongated and snake-like, with a pointed head and many teeth. It is covered …

Electric eel

Electrophorus electricus

The electric eel has bare skin, no scales, and a very elongated body that is rounded …

European grayling

Thymallus thymallus

The distinctive features of the European grayling are its spindle-shaped body, its upper jaw that reaches …

European perch

Perca fluviatilis

The European perch has a laterally compressed body covered with dense, small ctenoid scales. It has …

Fahaka pufferfish

Tetraodon lineatus

The skin of the Fahaka pufferfish is scaleless, but the head and body are covered with …

Fallfish

Semotilus corporalis

The body of the fallfish is slender with a blunt, pointed head. There is a single …

Finescaled four-eyed fish

Anableps microlepis

Anableps: Greek, ana = up + Greek, blepo, blepsis, -eos = glance, sight.The elongated cylindrical body …

Fourspine stickleback

Apeltes quadracus

The fourspine stickleback possesses an elongated, fusiform body lacking scales. Typically, it exhibits four or five …