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Bi-directional sex change and gonad structure in the gobiid fish |
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| Authors: | Makoto Sakurai Susumu Nakakoji Hisaya Manabe Shin-ichi Dewa Akihiko Shinomiya Tomoki Sunobe |
| Affiliation: | (1) Kagoshima Immaculate Heart College, 4-22-1 Toso, Kagoshima 890-8525, Japan;(2) Faculty of Fisheries, Kagoshima University, Kagoshima 890-0056, Japan;(3) Education Center, Kagoshima University, 1-21-30 Korimoto, Kagoshima 890-0065, Japan;(4) Diving Service Umi-Annai, 7-7 Masagohonmachi, Kagoshima 890-0067, Japan;(5) Tateyama Station, Field Science Center, Tokyo University of Marine Science and Technology, 670 Banda, Tateyama 294-0308, Japan |
| Abstract: | 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. |
| Keywords: | Sex change Trimma Gobiidae Hermaphroditism Social control |
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