Crappies are two species of North American freshwater fish of the genus Pomoxis in the family Centrarchidae (sunfishes). Both species of crappies are popular game fish among recreational anglers.
Crappie
A black crappie (P. nigromaculatus)
Image: White Crappie
Image: 2012 11 27 Monitoring at Site F, Salt Slough, San Luis NWR, CA 006cc
Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference in levels of osmolarity. To survive in fresh water, fish need a range of physiological adaptations.
Tench are common freshwater fish throughout temperate Eurasia.
Sturgeon are found both in anadromous and fresh water stationary forms
The critically endangered Mekong giant catfish
Dams can create issues for freshwater habitats.