Although hybrid catfish (Ictalurus punctatus × I. furcatus) now constitute about half of the industry production, few studies have assessed comparative growth and survival with other commercially important catfish. Growth assessment is particularly important at moderate to high temperatures because of the direct influence of temperature on ectothermic organisms and the increasing trend of warm to extreme environmental temperatures. Therefore, growth, condition factor, and survival of channel (I. punctatus), blue (I. furcatus), and hybrid catfish were compared following a 10-week growth experiment at moderate (23°C) and high (33°C) temperatures in tanks. It was hypothesized that hybrid catfish would outperform channel and blue catfish in overall growth due of heterosis, and growth of all three fish types would be greater at moderate than high temperatures, which are above the range for optimal channel and blue catfish growth. Channel catfish had the greatest growth and were in better condition compared to blue and hybrid catfish over moderate and high temperatures. All treatments had an average survival over 89% other than blue catfish at 33°C, which had an average survival of 63%. Therefore, these results indicate growth and condition factor in channel, blue, and hybrid catfish diminish at high temperatures, and channel catfish may outgrow blue and hybrid catfish at moderate to high temperatures.

中文翻译：

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中高温条件下幼年斑点叉尾鮰 (Ictalurus punctatus)、蓝鲶 (I.furcatus) 和杂交鲶 (I. punctatus × I.furcatus) 的生长、条件因素和存活率

尽管杂交鲶鱼（Ictalurus punctatus × I.furcatus）目前约占行业产量的一半，但很少有研究评估与其他具有重要商业价值的鲶鱼的生长和存活率的比较。由于温度对变温生物的直接影响以及温暖到极端环境温度的增加趋势，中等到高温下的生长评估尤其重要。因此，在中等（23°C）和高（33°C）条件下进行 10 周的生长实验后，比较了斑点叉尾鮰（ I. punctatus）、分叉鲶（I.furcatus ）和杂交鲶鱼的生长、条件因素和存活率。储罐内的温度。据推测，由于杂种优势，杂交鲶鱼在总体生长方面将优于斑点叉尾鮰和蓝鲶鱼，并且所有三种鱼类的生长在中等温度高于高温下都将更快，而高温高于斑点叉尾鮰和蓝鲶鱼的最佳生长范围。在中高温下，与蓝鲶鱼和杂交鲶鱼相比，斑点叉尾鮰的生长速度最快，并且状况更好。除蓝鲶鱼在 33°C 下的平均存活率为 63% 外，所有处理的平均存活率均超过 89%。因此，这些结果表明，斑点叉尾鮰、蓝鲶鱼和杂交鲶鱼的生长和状况因素在高温下会减弱，并且在中高温下，斑点叉尾鮰的生长速度可能超过蓝鲶鱼和杂交鲶鱼。