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 1.
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10 Facts About Freshwater fish
2.
Freshwater fish differ physiologically from salt water fish in several respects.
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3.
Many species of fish do reproduce in freshwater, but spend most of their adult lives in the sea.
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4.
Some other kinds of Freshwater fish are, on the contrary, born in salt water, but live most of or parts of their adult lives in fresh water; for instance the eels.
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5.
Warmwater Freshwater fish can survive cold winter temperatures in northern climates, but thrive in warmer water.
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6.
Common warmwater Freshwater fish include catFreshwater fish, largemouth bass, bluegill, crappies, and many other species from the family Centrarchidae.
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7.
About four in ten North American freshwater fish are endangered, according to a pan-North American study, the main cause being human pollution.
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8.
Many Yangtze Freshwater fish species have declined drastically and 65 were recognized as threatened in the 2009 Chinese red list.
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9.
Introduction of exotic Freshwater fish species into ecosystems is a threat to many endemic populations.
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10.
High densities of exotic Freshwater fish are negatively correlated with native species richness.
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