The effects of three commercial diets (AF PE and PP) that differed in nutritional value on growth, cannibalism and survival in Eurasian perch post-larvae were performed. Of the feeds used, the PE feed contained a lower level of crude protein and a higher level of crude fat with a higher level of saturated fatty acids (SFA) and a lower level of polyunsaturated fatty acids (PUFA) than the AF and PP feeds. Additionally, chemical composition, including the fatty acid (FAs) content of perch body, liver histology and vertebral column anomalies relative to tested diets were analysed. It was shown that the two-month perch fed by diet with the highest fat content and the lowest protein content (PE) achieved significantly higher weight and body length. During the experiment, a relatively higher survival was obtained in perch groups fed with PE and PP feeds. Significantly lower type II intra-cohort cannibalism in perch fed with two diets (PE and PP) was observed, which probably resulted from better assimilation and, consequently, a sense of greater satiety in fish (PE diet) and faster perception by perch of its presence in the experimental system (PP diet). Moreover, the increase in type II cannibalism in perch fed with the AF diet could be due to the poorer palatability of this feed (understood in terms of its availability). The results of our study confirmed the hypothesis that the level of fat in the body of fish depended on the level of crude fat from feed used; however, it was also found that the fatty acid composition of the perch body was irrespective of the content of FAs in the diet used. Our data suggest that differences in the level of proximate and FAs compositions in tested commercial diets do not affect the histological structure of the liver and the prevalence of skeletal malformation in Eurasian perch post-larvae.

进行了三种营养价值不同的商业饮食（AF PE和PP）对幼虫后欧亚鲈鱼生长，食人和存活的影响。在使用的饲料中，与AF和PP饲料相比，PE饲料中的粗蛋白含量较低，而粗脂肪的含量较高，饱和脂肪酸（SFA）含量较高，多不饱和脂肪酸（PUFA）含量较低。另外，分析了化学成分，包括相对于测试饮食的鲈鱼体内脂肪酸（FAs）含量，肝脏组织学和椎骨异常。研究表明，高脂和低蛋白（PE）的饮食喂养两个月的鲈鱼体重和体长显着提高。在实验过程中，饲喂PE和PP饲料的鲈鱼组具有相对较高的存活率。观察到用两种日粮（PE和PP）喂养的鲈鱼的第二群同类人相食行为明显降低，这可能是由于更好的同化导致的，因此，人们对鱼类（PE日粮）的饱腹感更高，并且对鲈鱼的鲈鱼食感更快。存在于实验系统中（PP饮食）。此外，以AF饲料喂养的鲈鱼中II型食人族的增加可能是由于这种饲料的适口性较差（从其可用性方面可以理解）。我们的研究结果证实了这样的假设，即鱼体内的脂肪水平取决于所用饲料中的粗脂肪水平。然而，还发现，鲈鱼体内的脂肪酸组成与所用饮食中脂肪酸的含量无关。