Freshwater

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 …

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 …

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. …

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 …

Least killifish

Heterandria formosa

Least killifish differ little in body shape from their closest relatives, the Poecilia. They have an …

Mango tilapia

Sarotherodon galilaeus

The mouth is small, with the lower jaw length being less than 1/3 of the total …

Mosquitofish

Gambusia affinis affinis

The male anal fin is modified and is an intermittent organ for introducing sperm into the …

Peled

Coregonus peled

The peled can be easily distinguished from other whitefish by its terminal mouth, in which the …