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SynopsisThe sexual structures of the populations of four Caribbean gobies were examined. Gobiosoma multifasciatum and Coryphopterus personatus are protogynous hermaphrodites, while G. illecebrosum and G. saucrum are gonochoristic. Sex changes were induced in females of the first two species in the laboratory, but not in females of the latter two species. The two hermaphroditic species live in large populations while the two gonochorists live in small groups. The significance of these findings to models of the evolution of protogyny are discussed.

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