The Asian catfish, Clarias magur, is an endangered fish species, which is immensely important due to its high commercial value in India and other South-East Asian countries. Various anthropogenic activities and natural habitat loss have greatly impacted the biodiversity of C. magur in natural water bodies, leading to the addition of this species to the endangered species list. The development of captive spawning and selection of an ideal broodstock size are critical steps to maximize the efficiency and robustness of conservation efforts for the catfish. An induced spawning experiment was conducted to ascertain the reproductive performance, egg and larval quality of catfish broodstock from fish with varying body weights. Five female C. magur broodfish from each of the following size ranges, F65 (65 ± 5.0); F130 (130 ± 7.9), F180 (180 ± 3.5) and F250 (253 ± 9.7g), were selected along with male broodfish with the same body weight range. The present study's results revealed that the stripping response was higher (F = 2.06; p = 0.15) for medium-sized F180 magur female broodstock; however, no significant differences were observed for this group. Total (F = 20.79; p < 0.001) and relative fecundity (F = 3.09; p = 0.057) were found to be significantly higher for F250 and F65 broodfish respectively. Total fecundity had a strong significant positive correlation (r = 0.99; p = 0.012) and also had significant linear regression relation (R² = 0.98; p = 0.012) to maternal size. Hatching rate was observed to be significantly higher (F = 7.82; p = 0.002) for the medium-sized broodfish, F130. The medium-sized broodstock of 130–180 g had strong positive influence on the growth and survival of the progeny, while F250 broodfish produced poor-quality larvae, which resulted in reduced larval growth performance and survival. Specific growth rate (SGR) and thermal growth coefficient (TGC) were also found to be significantly higher for F130 female broodstock. Hence, the selection of medium-sized (130–180) or 1- to 2-year-old female broodstock had a significant effect on the reproductive performance, egg and larval quality of magur in captivity. The results from this study can be utilized as helpful and practical information enhancing selection protocols for the hatchery operators to select ideal broodstock based on size, enabling the production of viable egg and larvae in indoor conditions and a scalable seed production system.

中文翻译：

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母体大小对濒危亚洲鲶鱼繁殖性能、卵和幼体质量的影响，Clarias magur

亚洲鲶鱼Clarias magur是一种濒临灭绝的鱼类，因其在印度和其他东南亚国家的高商业价值而极为重要。各种人为活动和自然栖息地丧失极大地影响了C的生物多样性。 magur在天然水体中，导致该物种被列入濒危物种名单。圈养产卵的发展和理想亲鱼规格的选择是最大限度提高鲶鱼保护工作效率和稳健性的关键步骤。进行了诱导产卵实验，以确定来自不同体重鱼类的鲶鱼亲鱼的繁殖性能、卵和幼体质量。五女C. 来自以下每个尺寸范围的magur亲鱼，F65 (65 ± 5.0)；F130 (130 ± 7.9)、F180 (180 ± 3.5) 和 F250 (253 ± 9.7g) 与体重范围相同的雄性亲鱼一起被选中。本研究的结果表明， 中型 F180 magur 雌性亲鱼的剥离反应较高（F  = 2.06；p = 0.15）；然而，该组没有观察到显着差异。 发现 F250 和 F65 亲鱼的总数（F  = 20.79；p  < 0.001）和相对繁殖力（F  = 3.09；p = 0.057）分别显着更高。总繁殖力呈极显着正相关（r = 0.99; p  = 0.012）并且 与母体大小也有显着的线性回归关系（R ²  = 0.98；p = 0.012）。观察到孵化率明显更高（F  = 7.82；p = 0.002) 对于中型亲鱼，F130。130-180 g的中型亲鱼对后代的生长和存活有很强的积极影响，而F250亲鱼产生的幼体质量较差，导致幼体生长性能和存活率下降。还发现 F130 雌性亲体的比生长率 (SGR) 和热生长系数 (TGC) 显着更高。因此，中型（130-180）或1-2岁雌性亲鱼的选择对人工饲养的magur的繁殖性能、卵和幼体质量有显着影响。这项研究的结果可用作有益和实用的信息，增强孵化场运营商的选择协议，以根据大小选择理想的亲鱼，