Corythoichthys insularis is a species of marine fish in the family Syngnathidae. It is found in the western Indian Ocean, from the Amirante and Comoros islands to the Maldives. It inhabits coral and rocky reefs at depths of , where it can grow to lengths of . This species is ovoviviparous, with sexual maturity being reached at .Dawson, C.E., 1985. Indo-Pacific pipefishes (Red Sea to the Americas). The Gulf Coast Research Laboratory Ocean Springs, Mississippi, USA The male carries the fertilised eggs in a brood pouch located under his tail.
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WoRMS