Bi-directional sex change and gonad structure in the gobiid fish Trimma yanagitai
Sakurai, Makoto | Nakakoji, Susumu | Manabe, Hisaya | Dewa, Shin-ichi | Shinomiya, Akihiko | Sunobe, Tomoki
Bi-directional sex change in the deep-water gobiid fish Trimma yanagitai was examined. The gonads of all individuals consisted of ovarian and testicular elements, and an accessory gonadal structure. In no gonads were both testicular and ovarian parts simultaneously active. Bi-directional sex changes occurred during the rearing experiments in aquaria under conditions of which there was co-existence of two males or plural females. The sex of individuals could be determined by their relative body size or social dominance: the largest individuals acting as male and the remainder as female.
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