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Reproductive pattern and maturity phases of indigenous Kunar snowtrout Schizothorax labiatus inhabiting Vishav Stream in Kashmir Himalaya, India
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2022-01-24 , DOI: 10.1007/s10641-022-01218-8
Mohammad Yasir Arafat 1 , Yahya Bakhtiyar 1
Affiliation  

The controlled breeding program of Schizothorax labiatus requires in-depth knowledge of its reproductive features, which were studied for 2 years (October 2017 to September 2019). The study revealed four maturity phases in S. labiatus differing morphologically as well as histologically. Overall gonadosomatic index (GSI) followed the same trend in both the sexes (p>0.05; t-test), but a significant difference in GSI was observed in March with females having a higher GSI than males (p<0.05; t-test). The peak values of GSI in both sexes were observed during April and May with an abrupt decrease in June. The minimum ova diameter (0.3 mm) showed high frequency during the regressing phase, whereas the maximum ova diameter (2.4 mm) showed high frequency during the spawning capable phase. Absolute and relative fecundity ranged from 2754±1388 to 13465±7508 ova and 14±10 to 45±12 ova/g body weight, respectively. Absolute fecundity showed a highly significant positive correlation (p<0.01) with ovary weight as compared to ovary length, total length, and the total weight of the fish. Length at first maturity (Lm) for males and females was estimated to be 23.6 cm and 27.6 cm, respectively, indicating that males mature earlier than females. GSI of both sexes was found to increase significantly with the water temperature from December to April (rs = 1.0 for males and rs = 0.9 for females; p<0.05). The unimodal distribution of oocytes revealed that all oocytes are released in a short period (total spawner) from the late spring to summer season.



中文翻译:

印度克什米尔喜马拉雅 Vishav 溪流原生库纳尔雪鳟的繁殖模式和成熟阶段

Schizothorax labiatus的受控育种计划需要深入了解其繁殖特征,研究了 2 年(2017 年 10 月至 2019 年 9 月)。该研究揭示了S. labiatus的四个成熟阶段,在形态学和组织学上都不同。总体性腺体指数 (GSI) 在两性中都遵循相同的趋势 ( p >0.05; t 检验), 但在 3 月份观察到 GSI 存在显着差异, 女性的 GSI 高于男性 ( p<0.05; t 检验)。男女 GSI 的峰值出现在 4 月和 5 月,6 月急剧下降。最小卵子直径(0.3 毫米)在退化阶段显示出高频,而最大卵子直径(2.4 毫米)在产卵能力阶段显示出高频。绝对和相对繁殖力范围分别为 2754±1388 至 13465±7508 卵和 14±10 至 45±12 卵/克体重。与卵巢长度、总长度和鱼的总重量相比,绝对繁殖力与卵巢重量呈极显着正相关(p <0.01)。首次到期长度 ( L m) 男性和女性的估计分别为 23.6 厘米和 27.6 厘米,表明男性比女性更早成熟。从 12 月到 4 月,发现两性的 GSI 随着水温显着增加(男性r s = 1.0,女性r s = 0.9;p <0.05)。卵母细胞的单峰分布表明,所有卵母细胞在春末到夏季的短时间内(总产卵期)释放。

更新日期:2022-01-25
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