Studies on phylogeny of hermaphroditism and social sturucture in fish

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In this study, mating system and phylogenetic rekationship among the gobiid genus Trimma, Priolepis and Trimmatom were investigated. Mating system was observed in aquarium. Those of Trimma tevegae, T. taylori and T. marinae were polygyny, randam mating and male-territory-visiting polygyny with sneaking, respectively. Sexuality of T. tevegae, T. taylori and T. marinae were protogyny, protandry and gonochore, respectively, corresponding to prediction by size-advantage model. Four species of Priolepis were captured as single or pairs, suggesting monogamous mating system. Phylogenetic analysis by mtDNA showed that Trimmatom was plesiomorphic, and Trimma and Priolepis were apomorphic. As Trimmatom is gonochore, the results indicate that evolution for gonochore to hermaphrodite to gonochore took place.