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http://dx.doi.org/10.5657/kfas.2006.39.3.297

Gonadal Development and Sex Ratio of Artificial Seedlings of the Oblong Rockfish Sebastes oblongus  

Kwak Eun-Joo (Wondo Regional Maritime Affairs & Fisheries Office)
Lee Kyung-Wo (Jeollanamdo Fisheries Research Institute)
Choi Nak-Hyun (Department of Aquaculture, Chonnam National University)
Park Chung-Kug (Department of Aquaculture, Chonnam National University)
Han Kyeong-Ho (Department of Aquaculture, Chonnam National University)
Lee Won-Kyo (Department of Aquaculture, Chonnam National University)
Yang Seok-Woo (Mokpo Regional Maritime Affairs & Fisheries Office)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.39, no.3, 2006 , pp. 297-302 More about this Journal
Abstract
We investigated gonadal development and sex ratio of artificial seedlings of the oblong rockfish Sebastes oblongus, based on samplings for 370 days just after parturition. The primordial germ cells and genital ridge appeared separately under the mesentery in the yolk-sac stage larva (total length: 7.10-7.77 mm) just after parturition. The primordial germ cells and genital ridge integrated to form primordial gonad in 5-day-old larvae (7.12-9.68 mm), and then proliferation of somatic cell and germ cell occurred in the gonad, which was maintained undifferentiated until 45-days after parturition (18.6-20.4 mm). The ovarian differentiation began in the larva of 50-days old (dab) after parturition (dap) (20.0-24.5 mm). The somatic tissues elongated from the both opposite end-sites of undifferentiated gonad were consequently fused and formed a complete ovarian cavity at 60-days old dap (25.5-32.0 mm). In 80-days old dap (37.3-47.2 mm), meiosis of oogonia occurred to be chromatin nucleolus stage oocyte. The perinucleolus stage oocytes appeared at in 130-days old dap (68.0-86.0 mm), and previtellogenic stage oocytes appeared in 370-days old dap (101.0-116.0 mm). Only female was observed in the artificially produced oblong rockfish in the present study. This result revealed the effect of higher temperature on the sex determination of the oblong rockfish..
Keywords
Sebastes oblongus; Sex ratio; Gonadal development;
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