Freshwater

Goldeye

Hiodon alosoides

The goldeye is a small fish with a compressed body that is deep in proportion to …

Goliath tigerfish

Hydrocynus goliath

The Goliath tigerfish has a body shape similar to a tuna's. Due to their predatory nature, …

Grass pickerel, Redfin pickerel

Esox americanus vermiculatus, Esox americanus americanus

Thin and cylindrical, grass and redfin pickerel look very similar to chain pickerel, with the same …

Grayling, Arctic

Thymallus arcticus

Graceful lines, large fins and spectacular coloration make the grayling a striking fish. The most striking …

Green pufferfish

Dichotomyctere fluviatilis

The body of the green pufferfish is short and rounded, with bulging eyes and a very …

Green swordtail

Xiphophorus hellerii

Green swordtails have elongated, narrow bodies that are flattened on the sides. They also have large …

Green terror

Andinoacara rivulatus, syn. Aequidens rivulatus.

The Green Terror is a stocky fish with a prominent forehead. In adult males, a pronounced …

Guppy

Poecilia reticulata

Guppies exhibit pronounced sexual dimorphism, with males and females differing in size, shape, and colouration. Males …

Herring, Pacific

Clupea pallasii

The body is prostrate, compressed from the sides, covered with easily drooping scales. Abdomen rounded, ventral …

Ide

Leuciscus idus

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

Inconnu

Stenodus leucichthys

The general shape of the inconnu's body is very similar to that of the charr or …

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 …

Longcomb sawfish

Pristis zijsron

The longcomb sawfish has an elongated, flat rostrum with tooth-like projections on either side. It is …

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 …

Malapterurus electricus

Malapterurus electricus

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

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 …

Mooneye

Hiodon tergisus

The Mooneye is a small fish with a compressed body that is deep in proportion to …

Mozambique Tilapia

Oreochromis mossambicus

The best known member of the tilapia group is the Mozambique tilapia (Oreochromis mossambicus), which is …

Muskellunge

Esox masquinongy

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

Muskellunge, Tiger

Esox masquinongy x Esox lucius

Tiger muskellunge was thought to be a separate species until scientists were able to cross northern …