Freshwater

Naked osman

Gymnodiptychus dybowskii

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

Nelma

Stenodus nelma

Nelma has a spindle-shaped body that is slightly flattened on the sides. Its mouth is large, …

New Zealand longfin eel

Anguilla dieffenbachii

The New Zealand longfin eel possesses a long, slender body with a large mouth filled with …

Ninespine Stickleback

Pungitius pungitius

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

Northern snakehead

Channa argu

The northern snakehead has an elongated, cylindrical body with a flattened, snake-like head, which gives the …

One-lined pencilfish

Nannostomus unifasciatus

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

Osteolepis macrolepidotus

Osteolepis macrolepidotus was a lobe-finned fish (Sarcopterygii) with a broad, flattened head and a tapering body …

Paddlefish

Polyodon spathula

The paddlefish is almost sharklike in appearance, and if you cut off its long paddle-like snout, …

Pallid sturgeon

Scaphirhynchus albus

The pallid sturgeon has a distinctive, prehistoric appearance. Its body is elongated, nearly cylindrical, with a …

Paradise fish

Macropodus opercularis

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

Pearl gourami

Trichopodus leerii

The Pearl gourami has an elongated, oval-shaped body that is strongly compressed laterally.

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. …

Pickerel, Chain

Esox niger

With its long, slender body, chain pickerel resembles northern pike and muskellunge, especially when young. It …

Pike, Northern

Esox lucius

The northern pike has an elongated body and head. The snout is broad and flat, resembling …

Piraya

Pygocentrus piraya

The piraya has a laterally compressed, roughly circular profile typical of piranhas. A distinctive feature is …

Porous seasonal killifish

Cynolebias porosus

The Porous seasonal killifish has a fusiform (spindle-shaped) body that is laterally compressed. The snout is …

Predatory carp

Chanodichthys erythropterus

The predatory carp has a body structure typical of an active pelagic predator — streamlined, elongated, …

Pyrrhulina filamentosa

Pyrrhulina filamentosa

Pyrrhulina filamentosa has an elongated body with a large caudal fin, the upper lobe of which …

Red-bellied piranha

Pygocentrus nattereri

The red-bellied piranha has a short, deep body shape. Its cross-section is compressed.All piranhas have large …

Redbelly tilapia

Coptodon zillii, tilapia zillii.

Large species with a dense build, narrow head and small strong jaws. The upper profile of …

Rudd

Scardinius erythrophthalmus

The rudd has a cylindrical shape and a deep body. It has a moderately forked tail …