首页> 外文OA文献 >Developmental Changes in Low-Salinity Tolerance and Responses of Prolactin, Cortisol and Thyroid Hormones to Low-Salinity Environment in Larvae and Juveniles of Japanese Flounder, Paralichthys olivaceus
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Developmental Changes in Low-Salinity Tolerance and Responses of Prolactin, Cortisol and Thyroid Hormones to Low-Salinity Environment in Larvae and Juveniles of Japanese Flounder, Paralichthys olivaceus

机译:低盐酸盐,皮质醇和甲状腺激素对低盐度环境的低盐度耐受性和反应的发育变化,幼虫和幼稚园,Paralichthys Olivaceus

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摘要

In Japanese flounder (Paralichthys olivaceus), metamorphic period involves not only transformation from larva to juvenile but also migration from offshore areas to estuaries. In the present study, the role of endocrine systems in low-salinity adaptation was examined during early development and metamorphosis of the flounder. Survival rate 48 hr after transfer to 1/8 SW was relatively high in yolk-sac larvae, decreased gradually to 0% at premetamorphosis, and increased to 100% at metamorphic climax. The ratio of prolactin (PRL)-immmunoreactive part to whole pituitary increased gradually during larval stages and reached a constant level during metamorphosis. When the larvae at premetamorphosis and metamorphic climax and the benthic juveniles were transferred from SW to 1/4 SW, PRL-immunoreactive part increased significantly 48 hr after the transfer at all stages examined. Whole-body concentration of cortisol was measured with a modified extraction method which is much robuster to lipid-rich sample than the ordinary method, but no significant difference was observed after the transfer. Whole-body concentrations of thyroid hormones decreased slightly but significantly at premetamorphosis and metamorphic climax. These results suggest possible involvement of PRL and thyroid hormones in low-salinity adaptation of the flounder during metamorphosis and inshore migration.
机译:在日本比目鱼(Paralichthys Olivaceus)中,变质时期不仅涉及从幼虫转变为少年,而且还迁移从离岸地区到河口。在本研究中,在早期发育和比目鱼的变态中检查了内分泌系统在低盐度适应中的作用。转移到1/8 SW后的存活率48小时在卵黄酸幼虫中相对较高,在前一角下逐渐降至0%,并在变质高潮下增加至100%。在幼虫阶段期间,催乳素(PRL)-immmmummmmereActive部分与整个脑垂体的比例逐渐增加,在变态期间达到恒定水平。当前大脉和变质高潮的幼虫和底栖幼虫从SW转移到1/4 SW时,在检查的所有阶段转移后,PRL-ImmuneSeactive部分在转移后显着增加了48小时。用改性的提取方法测量皮质醇的全体浓度,所述改性的提取方法与富含脂质样品的重燃,而不是普通方法,但在转移后没有观察到显着差异。在前一代和变质高潮中,全身浓度的甲状腺激素略微下降,但显着下降。这些结果表明PRL和甲状腺激素可能参与在变态和居住在变态和腹部迁移期间对比较的低盐度适应。

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