Freshwater

Alaska blackfish

Dallia pectoralis

The Alaska blackfish can be identified by its short, flattened snout, the posterior position of the …

Astyanax jordani

Anoptichthys jordani

Astyanax jordani is very close to A. mexicanus and their taxonomic affiliation is controversial. Some consider …

Brazhnikov's catfish

Tachysurus brashnikowi

Brazhnikov's catfish belongs to the family Bagridae (bagrid catfishes). The species is a demersal fish, meaning …

Campylomormyrus curvirostris

Campylomormyrus curvirostris, gnathonemus curvirostris, campylomormyrus rhynchophorus.

The snout of Campylomormyrus curvirostris is highly elongated and curved downward like a trunk, with a …

Campylomormyrus numenius

Campylomormyrus numenius

Campylomormyrus numenius possesses a highly elongated, ventrally curved rostrum, analogous to an elephant's trunk, terminating in …

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 …

Drum, Freshwater

Aplodinotus grunniens

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

Golden pencilfish

Nannostomus beckfordi

The genus name Nannostomus comes from the Latin nannus ("small") and the Greek stoma ("mouth"), referring …

Gudgeon

Gobio gobio

The Latin genus name Gobio comes from the word "goby," referring to its stocky shape and …

Hogsucker, Northern

Hypentelium nigricans

The Northern Hogsucker gets its name from its pig-like appearance, especially its head. It has a …

Mullet

Mugil cephalus, Mugil curema

The striped mullet (Mugil cephalus) has a bluish-gray or green coloration along the back, turning to …

One-lined pencilfish

Nannostomus unifasciatus

The name unifasciatus comes from the Latin words uni ("one") and fasciatus ("banded"), meaning "one-banded." The …

Ruffe

Gymnocephalus cernuus

The ruffe is very similar to the yellow perch in body shape and to the walleye …

Scaly osman

Diptychus maculatus

The body of the Scaly osman is fusiform (spindle-shaped), elongate, and shallow. The mouth is inferior …

Spined loach

Cobitis taenia

The spined loach has a long, slender body, slightly compressed laterally, which helps it move easily …

Stonecat

Noturus flavus

Stonecats have an olive, yellowish, or slate-colored upper half of the body and are the only …

Sturgeon, Lake

Acipenser fulvescens

Lake sturgeon are somewhat torpedo-shaped, and the upper lobe of the caudal fin is longer than …

Sturgeon, Shovelnose

Scaphirhynchus platorinchus

The shovelnose sturgeon has a broad, flat head with an elongated shovel-like snout. There are four …

Sturgeon: Green Sturgeon

Acipenser medirostris

Sturgeon and paddlefish, best known for their black caviar, belong to the order Acipenseriformes, but at …

Sucker, White

Catostomus commersoni

White suckers have inconspicuous coloration, usually sparse shades of white, yellow, and pink. Adults have almost …

Sucker: Northern Redhorse

Maxostoma macrolepidotum

Suckers are most easily distinguished by their small mouths and large fleshy lips. They have no …