Production of fermented protein hydrolysates and their effectiveness in feeding carp

In the modern world, fisheries occupy a large part of the economies of countries, as they provide the population with aquaculture products with high-grade protein in amino acids and lipids in fatty acids, which are necessary for a full human diet. In addition, the market of by-products and by-products of processing and their use in waste-free processing technology for feed, such as fish meal, fish oil, protein hydrolysates for fish feeding, has significantly expanded. In connection with the above, the aim of the work was to develop a scientifically based technology for obtaining vegetable and fish hydrolysate from by-products of oilseed production and fish processing waste to create formulations of mixed feeds of different ages of carp. In our research, the chemical composition of fish waste obtained during the processing of freshwater (carp, silver carp, rainbow trout) and marine fish (hake, herring, sprat) for feeding carp was studied. marine fish processing waste contains 3.11% more crude protein than freshwater fish processing waste. At the same time, the crude fat content in marine fish is 5.27 times higher, which negatively affects the production of protein hydrolysates. Data analysis showed that the content of crude protein in soybean meal is 11.23% higher, crude fat – 0.06%, and crude fiber – 8.66% lower. The content of easily hydrolyzable carbohydrates, which are more easily absorbed by carp in sunflower meal, is 4.5% higher than soy meal. The coefficient of visible digestibility (Kvp) of the digestibility of marine fish processing waste was 75.55%, and freshwater fish processing waste was 70.30%. The coefficient of apparent digestibility of crude protein of plant components was: soybean meal – 72.4%, and sunflower meal – 70.4%.