Freshwater

Ide

Leuciscus idus

The body of the ide is thick. It is distinguished by the following features: a shortened …

Ladyfish

Elops saurus

The ladyfish has an elongated, slender, silvery body with a blue-green back and fine scales. It …

Lamprey: Sea Lamprey

Petromyzon marinus

Fish without jaws are fish-like vertebrates, eel-like in shape, with a cartilaginous or fibrous skeleton in …

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 …

Madtom, Brown

Noturus phaeus

Brown madtom has a dull coloration. The upper part of the body has a chocolate brown …

Madtoms: Black Madtom

Noturus funebris

The madtom is recognized by its unique fleshy fin. In non-madtom catfish, the fat fin protrudes …

Malabar danio

Devario malabaricus

The Malabar danio has a fusiform (spindle-shaped) body and is a larger, more robust relative of …

Malapterurus electricus

Malapterurus electricus

Malapterurus electricus has a characteristic appearance that distinguishes it from most other catfish. It has an …

Mango tilapia

Sarotherodon galilaeus

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

Mbu pufferfish

Tetraodon mbu

The Mbu pufferfish is the largest representative of the pufferfish family in the world. It is …

Minnow, Fathead

Pimephales promelas

The fathead minnow has a puny, deep, compressed body with a short, flattened head. The snout …

Minnow: Golden Shiner

Notemigonus crysoleucas

Minnows are characterized by a single dorsal fin, pelvic fins, soft fin rays, cycloid scales, and …

Mosquitofish

Gambusia affinis affinis

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

Mullet

Mugil cephalus, Mugil curema

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

Muskellunge

Esox masquinongy

The muskellunge has an arrow-shaped body, long and smooth. The single dorsal fin with soft rays …

Naked osman

Gymnodiptychus dybowskii

The naked osman has an elongated, fusiform (spindle-shaped) body that is slightly compressed laterally. The body …

Ninespine Stickleback

Pungitius pungitius

The stickleback gets its name from the short and long spines on the first dorsal fin, …

One-lined pencilfish

Nannostomus unifasciatus

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

Paradise fish

Macropodus opercularis

This species exhibits sexual dimorphism. Males are larger than females and possess elongated filaments on their …

Peled

Coregonus peled

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

Perch, White

Morone americana

The white perch has a deep, thin body that rises steeply upward from each eye to …

Perch, Yellow

Perca flavescens

Unlike the white perch, which is actually a temperate perch, the yellow perch is a true …

Peters's elephant-nose fish

Gnathonemus petersii

The elephantnose fish has a moderately deep, laterally compressed body with a distinctive sharp, funnel-shaped snout. …