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Optimal combination of temperature and photoperiod for sex steroid hormone secretion and egg development of Oreochromis niloticus as determined by response surface methodology

文献类型： 外文期刊

作者： Qiang, Jun 1 ; He, Jie 1 ; Zhu, Jun-Hao 1 ; Tao, Yi-Fan 1 ; Bao, Jin-Wen 1 ; Yan, Yue 1 ; Xu, Pao 1 ; Zhu, Xiaowen 3 ;

作者机构： 1.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Minist Agr, Key Lab Freshwater Fisheries & Germplasm Resource, Wuxi 214081, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Jiangsu, Peoples R China

3.Guangdong Ocean Univ, Fisheries Coll, Zhanjiang 524025, Guangdong, Peoples R China

关键词： Oreochromis niloticus female; Temperature; Photoperiod; Steroid hormone; Ovarian development

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.361； 五年影响因子：2.411 ）

ISSN： 0306-4565

年卷期： 2021 年 97 卷

页码：

收录情况： SCI

摘要： For successful reproduction of farmed fish, it is important to understand the relationship between gonadal development and environmental factors such as temperature and photoperiod. In this study, we determined the effects of temperature (T) and photoperiod (Pp) on serum estradiol-17 beta (E2) and progesterone (P) contents, gonadosomatic index (GSI), and oocyte development in female tilapia. We used a central composite experimental design and response surface methodology. The experimental ranges were 18-36 degrees C for T and 0-24 h for Pp. The results show that the quadratic effects of T and Pp were highly significant for serum E-2 and P contents, GSI, and the ratio of stage III to stage II oocytes (P < 0.01), and that the linear effects of T and Pp were also significant for these indicators (P < 0.05). The T x Pp interaction significantly affected serum E-2 content (P < 0.05). Serum E-2 and P content, GSI, and the ratio of stage III to stage II oocytes increased and then decreased with increasing T or Pp. The best combination of T and Pp for egg development was 28.6 degrees C/14.29 h. We observed the part of ovarian tissue containing stage V oocytes that are about to be discharged. Shortening the photoperiod or lowering the water temperature delayed the development of ovarian tissue so that most oocytes remained at stage II, and there were many atretic follicles. There were significant positive correlations between female GSI and serum E-2, P, and the ratio of stage III to stage II oocytes. The results of this study provide a reference for the regulation of temperature and photoperiod to control broodstock gonadal maturation and hormone-induced broodstock spawning.

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