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Changes in Plasma Steroid Hormone Levels and Gonad Development by the Control of Photoperiods and Water Temperatures on Timing of Sexual Maturity of Rockfish (Sebastes schlegeli)

이영돈|김형배|백혜자|노섬|박무억
한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)|2004.03|Fisheries and Aquatic Sciences|제7권 제1호|pp. 16-22

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참고문헌

주제분류수산학

초록

Abstract

Plasma steroid hormone levels in the viviparous rockfish (Sebastes schlegeli) were examined in relation to gonadal histology under controlled photoperiods and water temperatures. To investigate those effects in S. schlegeli the photoperiod was maintained at 15L:9D in June and then it was gradually decreased to 9L:15D in October. It was then gradually increased to 12L:12D in January, followed by 14L:10D in February. The water temperature was 19-20℃ in July. From August to October, it was from 18℃ to 12℃. Then, it was dropped to a low of 9-11℃ in November to December and then gradually increased to 14-15℃ in February. In females, both plasma estradiol-17β (E2) and testosterone (T) levels from August to February showed a similar pattern in both the treatment and the control groups. In the treatment group, the peaks of plasma E2 and T were observed in November, and the peaks were closely correlated to histological observations. Oocytes contained many yolk globules (final vitellogenic oocytes), and oocytes at the migratory nucleus stage increased in size. Plasma levels of progesterone did not change much throughout the experimental period. However, in the control group, the peaks of E2, T, and progesterone were observed in February. These results indicate that the controlled photoperiod and water temperature accelerated sexual maturity, corresponding to the advancement of plasma E2 and T peaks by approximately 3 months. In males, plasma T levels showed a similar pattern from August to October in the treatment and control groups, though levels in the treatment group were higher than those in the control group. From histological observations, the treatment group copulated one month earlier.

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