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首页> 外文期刊>Journal of Applied Ichthyology >Survival and growth rates of wels catfish (Siluris glanis Linnaeus, 1758) larvae originating from fertilization with cryopreserved or fresh sperm
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Survival and growth rates of wels catfish (Siluris glanis Linnaeus, 1758) larvae originating from fertilization with cryopreserved or fresh sperm

机译：低温保存或新鲜精子受精的威尔士鱼（Siluris glanis Linnaeus，1758）幼虫的成活率和生长率

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Survival and growth of wels catfish (Silurus glanis L. 1758) larvae (both non-feeding and feeding), originating from fertilization with cryopreserved sperm were investigated. Non-feeding (yolk sac) larvae (n=100 individuals distributed over five replicates) were tested in the laboratory; feeding larvae (100 individuals in five replicates) were tested in both the laboratory and at a commercial fish farm (1000 individuals in triplicates). Water temperature was maintained at 22-23 degrees C during the 4-day test period on non-feeding larvae and 10days on feeding larvae. Larvae originated from cryopreserved or fresh sperm of different males collected in different years. In the laboratory experiments with feeding larvae, changes in standard length (SL), weight, condition factor, specific growth and survival rates were determined after 10days, while at the fish farm survival and length growth were determined after 10days. Final SL, weight and survival rate were analyzed on the non-feeding larvae. In all cases, larvae from fertilization with fresh sperm served as a control. A significant difference (P=0.034) was found in the 10-day standard length between larvae originating from cryopreserved sperm (1.92 +/- 0.13cm SL, N=250) and the control (1.89 +/- 0.14cm SL, N=250). Significant differences were also observed in the final SL (0.96 +/- 0.05cm in larvae from cryopreserved sperm vs 0.94 +/- 0.05cm in the control, P0.001) and weight (10.09 +/- 0.37g in the cryopreserved group vs. 9.02 +/- 0.30g in the control, P=0.018) of non-feeding larvae. No significant differences were found in either the survival rates of fry derived from fresh or from cryopreserved sperm. It is postulated that the observed differences can be attributed to the effect of individual males or broodstocks; however, genetic studies are required to confirm this hypothesis. This study gives evidence that the developed cryopreservation technology has no unfavorable effects on the viability of wels catfish larvae.
机译：研究了低温保存的精子受精引起的鱼（Silurus glanis L. 1758）幼虫（不喂食和喂食）的存活和生长。在实验室测试了非喂食（卵囊）幼虫（n = 100个个体，重复五次）。在实验室和商业化养鱼场（1000份，一式三份）中对饲喂幼虫（100份，一式五份）进行了测试。在非喂食幼虫的4天测试期间和喂食幼虫的10天中，水温维持在22-23摄氏度。幼虫起源于不同年份收集的不同男性的冷冻保存或新鲜精子。在喂食幼虫的实验室实验中，在10天后确定标准长度（SL），体重，条件因子，比生长和存活率的变化，而在养鱼场中，在10天后确定存活和长度的增长。在非喂食幼虫上分析最终的SL，体重和存活率。在所有情况下，以新鲜精子受精的幼虫作为对照。在低温保存的精子幼虫（1.92 +/- 0.13cm SL，N = 250）与对照组（1.89 +/- 0.14cm SL，N = 250）。最终SL（冷冻保存的精子幼虫为0.96 +/- 0.05cm，对照组为0.94 +/- 0.05cm，P <0.001）和体重（冷冻保存的组为10.09 +/- 0.37g，与对照中为9.02 +/- 0.30g，P ＝ 0.018）。从新鲜的或冷冻保存的精子得到的鱼苗的存活率均未发现显着差异。据推测，观察到的差异可归因于个别雄性或亲鱼的影响;但是，需要进行遗传学研究以证实这一假设。这项研究提供证据表明，先进的冷冻保存技术对威尔士cat鱼幼虫的生存能力没有不利影响。

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