Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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The seahorse is the only fish to have a neck.
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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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There is a disease called ichthyosis that turns the skin scaly like a fish.
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