Gonadal sex differentiation and effect of rearing temperature on sex ratio in black rockfish (Sebastes schlegeli) |
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| Authors: | Naotaka Omoto Yasunori Koya Byungsun Chin Yoh Yamashita Masahiro Nakagawa Tsutomu Noda |
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| Affiliation: | (1) Department of Research and Development, The Hokkaido Electric Power Co., Inc, Tsuishikari, Ebetsu, Hokkaido 067-0033, Japan;(2) Marine Ecology Research Institute, 300 Iwawada, Onjuku, Chiba 299-5105, Japan;(3) Department of Biology, Faculty of Education, Gifu University, Yanagido, Gifu 501-1193, Japan;(4) Fisheries Research Station, Field Science Education and Research Center, Kyoto University, Maizuru, Kyoto 625-0086, Japan;(5) Goto Station, National Center for Stock Enhancement, Fisheries Research Agency, 122-7 Tamanoura, Goto, Nagasaki 853-0508, Japan;(6) Miyako Station, National Center for Stock Enhancement, Fisheries Research Agency, 4-9-1 Sakiyama, Miyako, Iwate 027-0097, Japan |
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| Abstract: | Temperature-dependent sex determination has been demonstrated in some species of fish, and a high temperature during the period of sex differentiation typically produces a male-dominant population. This research investigated the gonadal sex differentiation and effect of rearing temperature on the sex ratio in larval black rockfish Sebastes schlegeli, which is a viviparous species. Two types of gonads were histologically distinguishable in fish 20 mm in total length (TL). The putative ovary started forming an ovarian cavity, while the putative testis was not clearly differentiated until 51 mm TL. In a temperature-controlled experiment, the proportions of females were 45% at 10°C, 46% at 14°C, 50% at 18°C, 63% at 22°C, and 83% (significantly different from 1:1 sex ratio) at 24°C. These results suggest that morphological sex differentiation in black rockfish occurs at approximately 20 mm in TL, and it is possible that high temperatures (24°C) induce not a male- but a female-dominant population in this species. |
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