Freshwater

Spotted lungfish

Protopterus dolloi

The spotted lungfish has a body very similar to that of an eel. It is elongated …

Squawfish, Northern

Ptychocheilus oregonensis

The mouth of the northern squawfish is terminal and large, extending backward beyond the anterior margin …

Steelhead

Oncorhynchus mykiss

Steelhead are usually slender and streamlined. The dorsal coloration is mostly blue-green with an olive hue, …

Sterba's corydoras

Corydoras sterbai

Compared to other species in the genus, Sterba's Corydoras has a relatively high body. There are …

Stonecat

Noturus flavus

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

Stoneroller, Central

Campostoma anomalum

The Central Stoneroller has a thick and poorly compressed torpedo-shaped body of dull gray color with …

Striped headstander

Anostomus anostomus

The body of the striped headstander is elongated, slightly compressed laterally, resembling a torpedo. The head …

Striped snakehead

It is a bony fish with an endoskeletal thorax. Body subcylindrical, head depressed, caudal fin rounded. …

Sturgeon, Atlantic

Acipenser oxyrinchus

The Atlantic sturgeon is dark brown or olive green with a white belly. The head is …

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, White

Acipenser transmontanus

The adult white sturgeon has a moderately blunt snout, spines closer to the tip of the …

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 …

Sumatra barb

Puntigrus tetrazona

These barbs have tall, strongly compressed bodies. There are no whiskers. Females are larger than males …

Sunfish, Green

Lepomis cyanellus

Latin name Lepomis cyanellus Other names Green perch, black perch, pond perch, creek perch, sand bass, …

Sunfish, Longear

Lepomis megalotis

With its stocky body, the longear sunfish is not as shrunken as the bluegill or pumpkinseed, …

Sunfish, Mud

Acantharchus pomotis

It has a rectangular compressed body that is dark reddish brown on the back and light …

Sunfish, Pumpkinseed

Lepomis gibbosus

A brilliantly colored fish, the adult pumpkinseed is olive green with blue and orange spots and …

Sunfish, Redbreast

Lepomis auritus

The body of the redbreasted sunfish is deep and compressed, but rather elongated for a sunfish. …

Sunfish, Redear

Lepomis microlophus

Pale golden-green on top, the redear sunfish has a rounded shape and is compressed at the …

Sunfish: Pumpkinseed Sunfish

Lepomis gibbosus

Each species has coarse scales and two united dorsal fins, the first of which is strongly …

Taranets char

Salvelinus taranetzi

This species is very similar to the Arctic char. Taranets char have a low, flattened body …