Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
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Sharks, like other fish, have their reproductive organs in their chests.
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Before making Finding Nemo, the animation gurus at Pixar Studios had to take a graduate class in fish biology and oceanography.
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The seahorse is the only fish to have a neck.
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