SEQUENCE OF GONADAL EVENTS AND ESTRADIOL LEVELS IN SPARUS-AURATA (L) UNDER 2 PHOTOPERIOD REGIMES
SEQUENCE OF GONADAL EVENTS AND ESTRADIOL LEVELS IN SPARUS-AURATA (L) UNDER 2 PHOTOPERIOD REGIMES
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DOI：
10.1111/j.1095-8649.1985.tb04301.x
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发表时间：
1985-01-01
影响因子：
2
通讯作者：
GORDIN, H
中科院分区：
文献类型：
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作者：
KADMON, G;YARON, Z;GORDIN, H
单独标记的S。将aurata保存在具有流动海水（21 ℃）的罐中。.+-. 2.degree. c）在他们生命的第二和第三年。每月对性腺进行活检和血液采样。第二年50条鱼中有13条，第三年35条鱼中有24条是表型雌性。从1981年7月至1982年8月，在16光/8暗光周期下饲养的鱼没有达到成熟;最初的卵巢生长波与闭锁波交替出现。从1982年8月开始缩短光周期，性腺在一个月内开始发育，并以高于自然光周期下饲养的对照鱼的速度进行。在自然光周期下，血清雌二醇水平（E2）在静息期（5月至10月）相对较低（108 ± 100）。11 pg ml-1），在卵黄发生后期（502 . ±. 76 pg ml-1）。高水平（1669 .+-. 312和1240。+-。172 pg ml-1）发生在卵黄发生早期和成熟期。雌激素水平的高值与雌激素水平的高值有关。aurata的原因是早期的报道指出了一个延长的繁殖季节，每天产卵，每天交替增加E2和17 α，20 β，dihydroxy-4-dichloroen-3-one，可能是这条鱼体内成熟的鱼精蛋白。在表型雄性中，E2在早期生精阶段最高（745 ± 0.01）。142 pg ml-1），但较低（155 ± 0.01 pg ml-1）。11 pg ml-1）。
Individually tagged S. aurata were kept in tanks with running sea water (21.degree. .+-. 2.degree. c) during their 2nd and 3rd yr of life. Gonads were biopsied and blood was sampled at monthly intervals. Thirteen of 50 fish in the 2nd yr and 24 of 35 fish in the 3rd yr were phenotypically females. Fish kept under 16Light/8Dark photoperiod from July 1981 to Aug. 1982 did not reach maturation; waves of initial ovarian growth alternated with waves of atresia. When photoperiod was shortened as from Aug. 1982, gonadal development commenced within a month and proceeded at a rate higher than that of the control fish reared under natural photoperiod. Under natural photoperiod estradiol serum levels (E2) were relatively low during the resting phase, May-Oct. (108 .+-. 11 pg ml-1), and during the late vitellogenic phase (502 .+-. 76 pg ml-1). High levels (1669 .+-. 312 and 1240 .+-. 172 pg ml-1) occurred during the early vitellogenic and the maturational phases. The high level of E2 during the spawning season of S. aurata is explained by earlier reports indicating a prolonged breeding season with the daily release of eggs, and alternating daily surges of E2 and 17.alpha., 20.beta., dihydroxy-4-pregnen-3-one, possibly a maturational progestin in this fish. In phenotypic males, E2 was highest during early spermatogenic phases (745 .+-. 142 pg ml-1) but was low (155 .+-. 11 pg ml-1) in males with running sperm.