Fishes live in virtually every water habitat found on earth. There are fish in mountain lakes above 4000 meters and fish in the deep ocean, at depth of at least 8300 meters.
The world’s deepest living fish Abyssobrotula galatheae was found in the Puerto Rican Trench at a depth of 8372 meters while Tibetan stoneloach Triplophysa stoliczkai lives at altitudes over 5200 meters in the Himalayas.
In the outflows of hot springs fish can be found living at temperatures of around 42 ° C whereas in the Antarctic, fish can be found resting on chunks of ice surrounded by water that is within a fraction of a degree of freezing solid.
The salinities of the water in which fish are known to live range from the purest water of granitic mountain basins to water over four times saltier than sea water.
Poor fisheries management is one of the biggest threats to marine biodiversity and benthic habitats.
Agricultural practices that alter water flow or increase water runoff from agricultural land would affect the quantity and quality of pond, lake and stream habitats for fish.
Agricultural practices that increase soil erosion greatly aquatic habitats by increasing the siltation and by carrying off nutrients that increase eutrophication.
Habitats of fish
