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Freshwater Fish

Freshwater fish

Fish that inhabit rivers, lakes and swamps. Often overlooked, they are an important part of the ecosystem. Often these fish inhabit both fresh and salt water during their life. The Three-spined Stickleback is an example. These small fish inhabit water ways in the Northern Hemisphere both in the Pacific and Atlantic areas.  Some populations commonly spend a portion of their life in salt water. They are one of the most studied fish because of their large morphological variation.

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Prickly Sculpin, Cottus asper, among lake weeds.
Portrait of a Prickly Sculpin, Cottus asper, among lake weeds.
Closeup of a Prickly Sculpin, Cottus asper.
Closeup of a Prickly Sculpin, Cottus asper.
Closeup of a Prickly Sculpin, Cottus asper, resting on its pectoral fins.
Side shot of a Prickly Sculpin, Cottus asper.
Closeup portrait of a Prickly Sculpin, Cottus asper.
Closeup of a Prickly Sculpin, Cottus asper, with open mouth.
Side shot of a Prickly Sculpin, Cottus asper.
Prickly Sculpin, Cottus asper. These common freshwater fish are sometimes called Bullheads.
Prickly Sculpin, Cottus asper, resting on a log in a pond.
Prickly Sculpin, Cottus asper, resting on a log in a pond.
Prickly Sculpin, Cottus asper, resting on a rock in a turbulent river.
Vibrant coloured male Three-spined stickleback, Gasterosteus aculeatus, in estuarine waters. Males get coloured like this dur...
Vibrant coloured male Three-spined stickleback, Gasterosteus aculeatus, in estuarine waters. Males get coloured like this dur...
Group of Three-spined stickleback, Gasterosteus aculeatus, in a rocky river environment.
Group of Three-spined stickleback, Gasterosteus aculeatus, in a rocky river environment.
Group of Three-spined stickleback, Gasterosteus aculeatus, in a rocky river environment.
Three-spined stickleback, Gasterosteus aculeatus, in a lake.
Three-spined stickleback, Gasterosteus aculeatus, among marginal grass in a river near the estuary.
Group of Three-spined stickleback, Gasterosteus aculeatus, sheltering under overhanging vegetation in the Campbell River.
Group of juvenile Three-spined stickleback, Gasterosteus aculeatus, in the edge of the estuary of the Campbell River
Group of juvenile Three-spined stickleback, Gasterosteus aculeatus, sheltering in marginal grasses at the edge of the estuary...