Porovnání účinnosti peletovaného krmiva s obsahem hmyzu a směsi s běžným složením při odchovu okouna říčního (Perca fluviatilis) v poloprovozních podmínkách

This thesis deals with the possibility of using insects as a potential source of proteins in artificial feed for Eurasian perch. In conventional feed, 25 % of fish meal was replaced by meal from adult Acheta domestica and Zophobas morio. There were performed two 12-week long experiments, the first one in the Experimental Fishery Workplace at the Faculty of Fisheries and Water Protection of the University of South Bohemia in Vodňany and the second one in the commercial operation of Anapartners s.r.o. Company in Prague Horní Počernice. The production indicators of the breed were evaluated and the fat and fatty acids in the fish muscles were analyzed as an important indicator of its nutritional value. At the end of both experiments, fish fed by experimental feeds showed lower length and weight gains and worse feed conversion, compared to fish fed by control diet. During the experiment and after its completion, the feed effect on fish survival were not noticed. Furthermore, there were not found any changes in fat content in fish muscles, but changes in the content of individual fatty acids were noticed. In fish fed with experimental feed, the content of linoleic acid (C18: 2n-6) increased as well as the total content of n-6 fatty acids, on the contrary, the content of n-3 fatty acids in the fish muscle decreased more than in fish fed by control diet. This also affected the resulting ratio of the n-6 fatty acid to n-3 fatty acid ratio, while this ratio increased significantly in the experimental fish group. Changes in fatty acids content in fish muscle were small and did not affect its nutritional value from the perspective of human consumption. In other experiments dealing with this topic, it is necessary to focus on testing of other insect species or to modify the quantity of substituted fishmeal