Here are the top six largest living fish species (within around 33,100 described species).
But, first of all, what is a fish? At first, it looks like an easy question, but in fact it is not. There are a wide range of animals we call “fish”, so it is not easy to define what makes a fish “a fish”. A general description: “a fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits” (wikipedia).
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The great white shark (scientific name: Carcharodon carcharias) is not the biggest shark (that title goes to the whale shark), but they are the largest predatory fish on Earth. According to the Guinness World Records Book, full grown adults are average 4.3–4.6 m (14–15 ft) in length, and generally weigh 520–770 kg (1,150-1,700 lb). But there are many claims of huge specimens up to 10 m (33 ft) in length. Newspapers and home photo albums are full of unconfirmed huge great white tales. And although few have been properly authenticated, there are a lot of circumstantial evidence to suggest that some great whites grow to more than 6 m (20 ft) in length.
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