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Synchronously Mature Intersex Japanese Flounder (Paralichthys olivaceus): A Rare Case

文献类型： 外文期刊

作者： Han, Tian 1 ; Cao, Wei 1 ; San, Lize 1 ; Xu, Zixiong 1 ; Wang, Guixing 1 ; He, Zhongwei 1 ; Liu, Yufeng 1 ; Ren, Yuqin 1 ; Wang, Yufen 1 ; Zhang, Xiaoyan 1 ; Hou, Jilun 1 ;

作者机构： 1.Chinese Acad Fishery Sci, China State Key Lab Mariculture Biobreeding & Sust, Beidaihe Cent Expt Stn, Qinhuangdao 066100, Peoples R China

2.Chinese Acad Fishery Sci, Hebei Key Lab Bohai Sea Fish Germplasm Resources C, Beidaihe Cent Expt Stn, Qinhuangdao 066100, Peoples R China

3.Hebei Agr Univ, China Ocean Coll, Qinhuangdao 066009, Peoples R China

关键词： synchronously sexual maturity; 21-hydroxylase activity; gene expressions; hormonal endocrinology

期刊名称：ANIMALS （ 影响因子：2.7； 五年影响因子：3.2 ）

ISSN： 2076-2615

年卷期： 2024 年 14 卷 20 期

页码：

收录情况： SCI

摘要： Simple Summary This study reports an unusual case of hermaphroditism in Japanese flounder captured from the Bohai Sea. In this study, the results showed that the heterozygosity of the intersex Japanese flounder was 0.632, with the synchronous maturation of the testis and ovary, and eggs and the sperm were capable of fertilization. The levels of reproduction-related hormones were intermediate; the activity of 21-hydroxylase was reduced by approximately 20.0%.Abstract Japanese flounder is usually gonochoristic, with gonads that are either testes or ovaries. Here, we report an unusual case of hermaphroditism in Japanese flounder captured from the Bohai Sea. In the intersex flounder, the membrane of the upper ovary was closely connected to the abdominal muscles and internal organs, and the eggs filled the entire abdomen. The lower ovary was small and closely connected to the testes. The testes contained few fully mature sperm. Both eggs and sperm were capable of fertilization. The levels of several reproduction-related hormones (17 beta-estradiol, 11-ketotestosterone, 17 alpha, 20 beta-dihydroxyprogesterone, luteinizing hormone, follicle-stimulating hormone, and testosterone) in the intersex flounder were intermediate, between those in females and males. The results showed that the heterozygosity of the intersex flounder was 0.632, and there were 28 single-nucleotide polymorphisms in the cyp21a gene. Compared with that of wild flounder, the activity of 21-hydroxylase was reduced by approximately 20.0%, and expressions of cyp19a, amh, and dmrt1 differed. We present the first report of its kind, detailing the anatomy, hormonal endocrinology, molecular biology, and physiology of the intersex Japanese flounder.

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