Freshwater

Freshwater fish spend part or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%.

Showing 1–10 of 10

Austrolebias bellottii

The Argentine pearlfish has a laterally compressed, fusiform (spindle-shaped) body with a rounded profile. Males are …

Poecilia sphenops

The Black Molly has an elongated body. Females tend to be more rounded in appearance. The …

Esox americanus vermiculatus, Esox americanus americanus

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

Xiphophorus hellerii

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

Poecilia reticulata

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

Esox masquinongy

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

Esox masquinongy x Esox lucius

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

Esox niger

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

Esox lucius

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

Cynolebias porosus

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