Fish is an aquatic animal and there are different kinds of fishes that include Jawless fish, Armoured fish, cartilaginous fish, Ray finned fishes and Lobe finned fishes. The world's smallest fish is Philippine Gobey and largest predatory fish on the earth is great white shark.
Records say that fish has been on the earth since 450 million years that is before the existence of dinosaurs. It is believed that Gold fish can live for more than 20 years and researchers have predicted that some fish species can even swim backwards.
40% of total fishes in the world inhabit fresh water and still the researchers are examining to find the world's fastest fish whether it is a sailfish or marlin fish.
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