Changes in plasma levels of steroid hormones during sexual maturation of female red seabream Pagrus major.
Changes in plasma levels of steroid hormones during sexual maturation of female red seabream Pagrus major.
复制标题
雌性真鲷性成熟过程中血浆类固醇激素水平的变化。
DOI：
10.2331/suisan.54.585
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发表时间：
1988
影响因子：
0.4
通讯作者：
Y. Nagahama
中科院分区：
文献类型：
--
作者：
K. Ouchi;S. Adachi;Y. Nagahama
雌性真鲷（Pagrus major）性成熟过程中17β-雌二醇（E2）、睾酮（T）和17α，20β-二羟基-4-异戊烯-3-酮（17α，20β-diOHprog）水平的变化与性腺指数和卵巢组织学的变化相关。4月份收集的卵黄生成雌性动物的数量略有增加（约300 pg/ml）。雌二醇-17 β水平的急剧增加发生在5月收集的雌性中，其含有成熟的卵母细胞（即，生殖泡消失，卵质完全透明）以及卵黄发生各阶段的卵母细胞。虽然血浆睾酮水平在4月和5月也升高，但升高的幅度远小于雌二醇-17 β。在其余采样期内，睾酮水平均低于100 pg/ml。在整个采样期间，17α，20β-diOHprog均存在于血浆中，但水平（约200 pg/ml）低于鲑科鱼类。在4月收集的产卵前雌性和5月收集的产卵雌性中发现轻微但显著的增加（约400 pg/ml）。这些结果进行了讨论，与以前的作品在血浆类固醇水平的鲑鱼和其他物种的总同步或组同步类型的卵巢的季节性变化。
Changes in estradiol-17β, testosterone and 17α, 20β-dihydroxy-4-pregnen-3-one (17α, 20β-diOHprog) levels were correlated with changes in gonadosomatic index and ovarian histology during the sexual maturation of female red seabream Pagrus major.Between January and March, plasma estradiol-17β levels were very low (below 200pg/ml). A slight increase was observed in vitellogenic females (about 300pg/ml) collected in April. A dramatic increase in estradiol-17β levels occurred in females collected in May, which contained mature oocytes (i.e., the germinal vesicle had disappeared and the ooplasm was completely trans-lucent) as well as oocytes at various stages of vitellogenesis. Although plasma testosterone levels also increased in April and May, the magnitude of elevation was much smaller than that of estra-diol-17β. Testosterone levels were less than 100pg/ml throughout the remainder of the sampling periods. 17α, 20β-diOHprog was present in plasma throughout the sampling periods, but the levels (about 200pg/ml) were lower than those in salmonids. A slight but significant increase (about 400pg/ml) was found in prespawning females collected in April and spawning females in May. These results are discussed in relation to previous works on seasonal changes in plasma steroid levels of salmonids and other species which have ovaries of the total synchronous or group synchronous type.