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Which fish can double its size by swallowing water?

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Porcupinefish have the ability to inflate their bodies by swallowing water or air, thereby becoming rounder. This increase in size (almost double vertically) reduces the range of potential predators to those with much bigger mouths. read more

It is known for its ability to swallow fish larger than itself. It has a worldwide distribution in tropical and subtropical waters, in the mesopelagic and bathypelagic zones at a depth of 700–2,745 m (2,297–9,006 ft). read more

Yes they can as long as it is the correct salinity. However if the salinity is too high/low it could quickly cause disease and end up killing your fish. read more

It is known for its ability to swallow fish larger than itself. It has a worldwide distribution in tropical and subtropical waters, in the mesopelagic and bathypelagic zones at a depth of 700–2,745 m (2,297–9,006 ft). Weight and length. The black swallower is a small fish, with a maximum known length of 25 cm (9.8 in). read more

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