Wei, S.; Hua, Z.; Yang, Y.; Ma, F.; Han, W.; Zhang, W.; Ying, C.; Deng, Y.; Liu, K. Characterization of the Ovarian Development and Associated Factors during the Breeding Migration of Coilia nasus in the Yangtze River. Fishes2024, 9, 90.
Wei, S.; Hua, Z.; Yang, Y.; Ma, F.; Han, W.; Zhang, W.; Ying, C.; Deng, Y.; Liu, K. Characterization of the Ovarian Development and Associated Factors during the Breeding Migration of Coilia nasus in the Yangtze River. Fishes 2024, 9, 90.
Wei, S.; Hua, Z.; Yang, Y.; Ma, F.; Han, W.; Zhang, W.; Ying, C.; Deng, Y.; Liu, K. Characterization of the Ovarian Development and Associated Factors during the Breeding Migration of Coilia nasus in the Yangtze River. Fishes2024, 9, 90.
Wei, S.; Hua, Z.; Yang, Y.; Ma, F.; Han, W.; Zhang, W.; Ying, C.; Deng, Y.; Liu, K. Characterization of the Ovarian Development and Associated Factors during the Breeding Migration of Coilia nasus in the Yangtze River. Fishes 2024, 9, 90.
Abstract
Coilia nasus is a typical anadromous migratory fish in the lower reaches of the Yangtze River. Every year, C. nasus cluster offshore and swim upstream along the Yangtze River into the tributaries and lakes in the middle and lower reaches of the Yangtze River to breed. In this study, female C. nasus collected as the subjects from Chongming section in Shanghai, Taizhou section in Jiangsu and Anqing section in Anhui. The ovaries were used for examining in tissue sections and researching of gene expression including follicle stimulating hormone receptor (fshr), luteinizing hormone receptors (lr), kisspeptin-1 (kiss1) and forkhead box l2 (foxl2) related to the reproductive development, and the estrogen (estradiol, E2) and progesterone (17α,20β-dihydroxy-4-pregenen-3-one, 17α,20β-DHP) were also analyzed in serum levels. The results showed that, first, the growth period of oocytes was small in stage II of ovarian development, in which both E2, 17α,20β-DHP levels and gene expression were low. Then, in stage Ⅲ, the growth period of oocytes were become large, as well as the yolk granules and oil droplets began to appear. Simultaneously, E2 and expression of kiss1 and foxl2 were significantly elevated. Finally, stage Ⅳ was the period of large accumulation of nutrients in oocytes, and 17α,20β-DHP level and expression of fshr and lhr were significantly elevated. The results have enriched the theoretical study of ovarian development in the natural population of C. nasus, supplemented the biological basis of C. nasus reproduction, and scientifically supported the study of C. nasus population ecology and resource conservation.
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