Effect of temperature decrease on oocyte development, sex steroids, and gonadotropin β-subunit mRNA expression levels in female Japanese eel Anguilla japonica

被引：21

作者：

Sudo, Ryusuke ^{[1
]}

Tosaka, Ryota ^{[2
]}

Ijiri, Shigeho ^{[3
]}

Adachi, Shinji ^{[3
]}

Suetake, Hiroaki ^{[4
]}

Suzuki, Yuzuru ^{[5
]}

Horie, Noriyuki ^{[6
]}

Tanaka, Satoru ^{[6
]}

Aoyama, Jun ^{[1
]}

Tsukamoto, Katsumi ^{[1
]}

机构：

[1] Univ Tokyo, Atmosphere & Ocean Res Inst, Chiba 2778564, Japan

[2] Natl Res Inst Aquaculture, Tamaki, Mie 5190423, Japan

[3] Hokkaido Univ, Grad Sch Fisheries Sci, Div Marine Biosci, Hakodate, Hokkaido 0418611, Japan

[4] Fukui Prefectural Univ, Fukui 9170003, Japan

[5] Univ Tokyo, Fisheries Lab, Shizuoka 4310214, Japan

[6] IRAGO Inst, Aichi 4413605, Japan

来源：

FISHERIES SCIENCE | 2011年 / 77卷 / 04期

基金：

日本学术振兴会;

关键词：

Japanese eel; Temperature decrease; Oil drop; 11-KT; Gonadotropins; GTH-I-BETA; EUROPEAN EEL; PREVITELLOGENIC OOCYTES; DIFFERENTIAL EXPRESSION; SPAWNING MIGRATION; DIEFFENBACHII; MATURATION; 11-KETOTESTOSTERONE; AUSTRALIS; OOGENESIS;

D O I：

10.1007/s12562-011-0358-3

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

To improve understanding of the mechanism of early ovarian development in eels, the effects of water temperature decrease on oocyte development, plasma levels of sex steroids [estradiol 17 beta (E2), testosterone (T), 11-ketotestosterone (11-KT)], and gonadotropin beta-subunit [follicle-stimulating hormone (FSH beta), luteinizing hormone (LH beta)] messenger RNA (mRNA) expression levels were investigated. A total of 27 female Japanese eels Anguilla japonica were divided into initial, control, and test (water temperature decrease) groups. Starting on 22 September 2009, eels in the test group were reared in a tank with gradual temperature decrease from 25A degrees C to 15A degrees C over 39 days, while the control group was maintained at 25A degrees C. The test group accumulated more oil droplets in their oocytes than did the other groups. Levels of sex steroids, especially 11-KT, were higher in the test group. In contrast, FSH beta and LH beta mRNA expression levels were lower in the test group. These results suggest that water temperature decrease only induced an early stage of ovarian development that was partly affected by an 11-KT increase. For further maturation, other environmental factors related to induction of gonadotropin increase appear to be needed.

引用

页码：575 / 582

页数：8

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