Freshwater

African brown knifefish

Xenomystus nigri

The body of this fish is unusual: it is flattened ventrolaterally and elongated, giving it a …

Alewife

Alosa pseudoharengus

A small silvery gray with a greenish or bluish tint to its back, the alewife usually …

Bighead carp

Hypophthalmichthys nobilis

The bighead carp has a deep, laterally compressed body with a characteristically very large head, which …

Black tetra

Gymnocorymbus ternetzi

The black tetra has a flat, tall body.

Blotched upside-down catfish

Synodontis nigriventris

Body stocky, slightly flattened at the sides. Back more convex than abdomen, eyes large, mouth lower …

Blue leopard corydoras

Corydoras paleatus

The Blue Leopard Corydoras has a strongly curved back line and an almost flat abdomen. Its …

Broad whitefish

Coregonus nasus

The Broad Whitefish has a broad, compressed body. Its nose is thick and humped, protruding behind …

Bushymouth catfish

Ancistrus dolichopterus

The Bushymouth catfish has a flattened body that is completely covered in polygonal bony plates. Its …

Cardinal tetra

Paracheirodon axelrodi

The Cardinal tetra has an elongated body that is slightly flattened on the sides. The females …

Cascarudo

Callichthys callichthys

Cascarudo has an elongated, slightly flattened body covered with two rows of bony plates. It has …

Chukot char

Salvelinus andriashevi

The Chukot char is a relative of the Pacific whitespotted char (Salvelinus leacomaenis). Its body is …

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.

Drum, Red

Sciaenops ocellatus

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

Eastern mosquitofish

Gambusia holbrooki

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

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 …

Goldfish

Carassius auratus

The body of the goldfish is short and tall with a slightly angular shape. It is …

Herring

Clupea

Body compressed from the sides, with jagged edge of abdomen. Scales moderate or large, rarely small. …

Herring, Atlantic

Clupea harengus

The body is not high (its height is about 1/5 of body length). Head is comparatively …

Honey sucker

Gyrinocheilus aymonieri

The scientific name was given in honour of the French linguist and explorer Étienne Aymonier (1844-1929).The …

Humpback whitefish

Coregonus pidschian

The body of the humpback whitefish becomes more pronounced with age, growing taller. A well-defined hump …

Least cisco

Coregonus sardinella

The body of the Least Cisco is elongated, somewhat compressed at the sides, with the greatest …