The bluegill ,(which has three relatively unknown subspecies,the Florida Bluegill, Hand Painted Bluegill and Northern Bluegill), is a species of North American freshwater fish, native to and commonly found in streams, rivers, lakes, ponds and wetlands east of the Rocky Mountains. It is the type species of the genus Lepomis, from the family Centrarchidae in the order Perciformes.
Bluegill
Bluegill caught on 14 June 2004 from Lake Lanier
Male bluegill
Bluegill caught in an Alabama pond
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.