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| Gonadal Development and Changes in Concentration of Serum Sex Hormones in Schizothorax irregularis |
| ZHAO He1,2,3, ZHAO Nianhua1,2,3, LI Li2,3,4, QIANG Zhuang2,3,4, NIE Zhulan1,2,3, WEI Jie1,2,3 |
1. College of Animal Science and Technology, Tarim University, Alaer 843300, China;
2. State Key Laboratory BreedingBase for The Protection and Utilization of Biological Resources in Tarim Basin Co-funded by Xinjiang Corps andThe Ministry of Science and Technology, Alaer 843300, China;
3. Key Laboratory of Tarim Animal HusbandryScience and Technology, Xinjiang Production & Construction Corps, Alaer 843300, China;
4. School of Life Science and Technology, Tarim University, Alaer 843300, China |
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Abstract To investigate the annual development of testis and ovary of Schizothorax irregularis and the changes in sex hormone content in serum, samples were taken monthly in the Kizil River from August 2020 to August 2021, and a total of 194 samples were obtained. Their testis and ovary were observed by conventional histological method. The otoliths were used as identification material to determine the minimum age at sexual maturity of the fish. The eggs were selected to depict the distribution of egg diameter to determine the spawning type. The results showed that S. irregularis testis and ovary development was divided into six periods; the minimum age at sexual maturity was 2 years for males and 3 years for females, and testis development was earlier than ovary development; S. irregularis spawn from March to May, and the number percentage of egg peaked at 2.9—＜3.1 mm in diameter, and very few mature eggs were present in the ovary at stage Ⅵ after spawning, which was judged to be a fully synchronized spawning type. The maximal serum concentrations of estradiol and testosterone were observed at stage Ⅴ in both females and males. The findings showed that S. irregularis gonads matured and spawned from March to May 2017, and the concentrations of estradiol and testosterone were increased significantly during the reproduction of S. irregularis.
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Received: 03 September 2021
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