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Cyclothone

genus

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Cyclothone is a genus containing 13 extant species of bioluminescent fish, commonly known as 'bristlemouths' or 'bristlefishes' due to their shared characteristic of sharp, bristle-like teeth. These fishes typically grow to around 1-3 inches (though some can be larger). They are most commonly found in the mesopelagic zone of the ocean, and are mostly found at depths of over 300 meters (1,000 feet).Cyclothone is believed to be the most abundant genus of fish on Earth, with estimates that there are up to a quadrillion individuals (i.e. one million billion in the short scale or 1015). Their abundance is so large that they are also believed to be the most abundant genus of vertebrates on earth.

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