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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 .
The natural habitat of the kuhli loach is the sandy beds of slow-moving rivers and clean mountain streams. They are a social fish and are typically found in small clusters (they are not schooling fish but enjoy the company of their species), but are cautious and nocturnal by nature and swim near the bottom where they feed around obstacles ...
The fish's suckermouth, with its fleshy lips, is located in an inferior position at the bottom of its head, as the fish obtains its food from bottom surfaces. [5] The white sucker is often mistaken for different species of suckers and redhorses , but can be distinguished by the complete lateral line system containing 55–85 small scales. [ 6 ]
The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
Venomous fish are found in almost all habitats around the world, but mostly in tropical waters. They wound over 50,000 people every year. [119] Venomous fish carry their venom in venom glands and use various delivery systems, such as spines, sharp fins, barbs, spikes or fangs.
The tench or doctor fish (Tinca tinca) is a fresh-and brackish-water fish of the order Cypriniformes found throughout Eurasia from Western Europe including Britain and Ireland east into Asia as far as the Ob and Yenisei Rivers. [3] It is also found in Lake Baikal. [4] It normally inhabits slow-moving freshwater habitats, particularly lakes and ...
The common logperch (Percina caprodes), sometimes simply known as the logperch, is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. Like other logperches, it has the typical vertical barring along the flank and a ...
Other projects involve the protection of native fish habitat on federal lands. A large decline in wetlands and riparian zones are the major factor in the decline of native fish, due to agriculture, outwelling, dredging, and flood control. Arizona fishes can also be found in small ponds, such as here at Santa Catalina Mountain in Tucson, AZ