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首页> 外文期刊>African Journal of Aquatic Science >Does reservoir trophic status influence the feeding and growth of the sharptooth catfish, Clarias gariepinus (Teleostei: Clariidae)?
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Does reservoir trophic status influence the feeding and growth of the sharptooth catfish, Clarias gariepinus (Teleostei: Clariidae)?

机译：水库的营养状态会影响尖齿cat鱼（Clarias gariepinus（Teleostei：Clariidae））的摄食和生长吗？

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摘要

The diet and growth of sharptooth catfish, Clarias gariepinus, in an oligotrophic system (Kat River Reservoir, Eastern Cape, South Africa) were compared to those in a eutrophic system (Laing Reservoir, Eastern Cape) to determine if the trophic status of a waterbody had an effect on the growth rate of the species. In order of importance, the diet of catfish in Kat River Reservoir consisted of fish, insects, zooplankton, plant material and other items, while the diet of catfish in Laing Reservoir consisted of fish, plant material, zooplankton, other vertebrates and insects. The diets of catfish in the two reservoirs had a similarity index of 68.1% and there was no significant difference in their nutritional value. Fish prey was the most important dietary component in both reservoirs. Temperature regime and zooplankton and zoobenthos density were similar in both systems. However, fish prey density was significantly higher in the eutrophic Laing Reservoir and catfish grew significantly faster in that system. The slower growth rate in Kat River Reservoir was attributed to the higher energy costs associated with the capture of fish prey, which was less abundant than in Laing Reservoir. Trophic status therefore had an indirect effect on catfish growth by influencing the availability of fish prey.
机译：比较贫营养系统（南非东开普省的凯特河水库）和富营养系统（东部开普省的Laing水库）中尖齿cat鱼Clarias gariepinus的饮食和生长，以确定水体的营养状态对物种的生长速度有影响。从重要性上讲，吉特河水库的of鱼饮食包括鱼类，昆虫，浮游动物，植物材料和其他物品，而莱因水库的of鱼饮食包括鱼类，植物材料，浮游动物，其他脊椎动物和昆虫。两个水库中of鱼的饮食相似度为68.1％，营养价值无显着差异。鱼类是两个水库中最重要的饮食成分。在这两个系统中，温度状况，浮游动物和底栖动物的密度相似。但是，在富营养化的Laing水库中，鱼类的猎物密度明显更高，而cat鱼在该系统中的生长速度明显更快。吉特河水库增速较慢的原因是与捕捞猎物相关的能源成本较高，这比莱因水库的丰富程度要低。因此，营养状态通过影响鱼类猎物的可获得性而对cat鱼的生长产生间接影响。

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