Fish belong to the category of vertebrate animals. They are characterized as animals with a backbone having gills to breathe in water. They also have fins and a streamlined body that assists them in surviving in water. Fish are often categorized on the basis of their habitat namely; tropical fish, coldwater fish and freshwater fish.
Freshwater fish live in the fresh waters of the rivers and lakes. The water conditions in freshwater bodies are very different from the one found in oceans and seas in terms of the level of salinity. Freshwater bodies such as rivers and lakes show less than 0.05 percentage of salinity. Owing to the difference in the salt level, freshwater fish have certain adaptations in their gills, scales and kidneys to survive in such conditions. They can survive in diversified altitudes, be it mountains or low lying rivers.
It is believed that about 41 percent of the fish live in freshwaters. Some of freshwater fish include African Butterfly Cichlid, Argus Fish, Asian Arowana, Arnoldi, Amiet's Lyretail, Burmese Snakehead, Buenos Aires Tetra, Badis, Barca Snakehead, Batik Loach, Banded Bichir, Bishop livebearer, Black Phantom tetra, Benny Tetra, Big Toothed Piranha, Black Small Fighter, Celebes Halfbeak, Ceylon Snakehead, Clown Barb, Dwarf Gourami, Electric Yellow Lab, Eureka Cichlid, Flagtailed Catfish, Flame Tetra, Giant Danio, Hogchoker, Jelly Bean Tetra, Knife Livebearer, Leopard Danio, Madagascar, Rainbow fish, Neon Tetra, Niger Snakehead, Ocellated Snakehead, Paradise Fish, Rainbow Shark, Red Devil, Sabretooth Tetra, Siamese Algae Eater, Tiger Barb, Turquoise Cichlid, Mountain Minnow and Zebra Loach.
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