Description: The BIGGEST FRESHWATER FISH CAUGHT ON YOUTUBE?! (600 LBS), 5 of The Largest Freshwater Fish In The World, Top 5 LARGE Fish For Your Aquarium, Top 10 Biggest Freshwater Fish In The World, 20 Biggest River Monsters Ever Caught
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Freshwater fish are those that spend some or all of their lives in fresh water , such as rivers and lakes , with a salinity of less than 0.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations .
41.24% of all known species of fish are found in fresh water. This is primarily due to the rapid speciation that the scattered habitats make possible. When dealing with ponds and lakes, one might use the same basic models of speciation as when studying island biogeography .
Freshwater fish differ physiologically from salt water fish in several respects. Their gills must be able to diffuse dissolved gasses while keeping the salts in the body fluids inside. Their scales reduce water diffusion through the skin: freshwater fish that have lost too many scales will die. They also have well developed kidneys to reclaim salts from body fluids before excretion.