Evaluation of the nutritional value of mixed feed for salmon with the addition of hydrolysis products of sprat waste

The paper shows a development trend of industrial salmon aquaculture in Russia and discusses some issues of feed production. Sustainability of using sprat waste hydrolysis products – heads of smoked sprats in the composition of mixed fodders has been substantiated. The process of obtaining peptide-protein and protein-fatprotein feed additives as a result of high-temperature processing of sprat waste under pressure in a hydroreactor has been considered. The chemical composition of dehydrated feed additives and mixed feed obtained with their use has been studied. Freeze-dried peptide-protein supplement contains 82.7% water-soluble low molecular weight protein and minor admixtures of fat (8.6%) and minerals (2.0%). Convection dried protein-fatmineral supplement contains 60.9% water-insoluble high molecular weight protein, 20.1% minerals (calcium and phosphorus) and 11.0% fat. Experiments have been carried out on the use of the obtained additives in the composition of feed for the fry of the European whitefish coregonus lavaretus in industrial aquaculture as a source of protein, fat and mineral components. The production of control compound feeds has been carried out on the basis of feed fish meal according to the FAO recipe for salmon. Obtaining experimental compound feeds has been carried out by introducing into the basic formulations, respectively, 5% and 10% protein and protein-fat-mineral additives obtained on the basis of sprat waste hydrolysates. Obtaining experimental compound feeds has been carried out by introducing into the basic formulations, respectively, 5% and 10% protein and protein-fat-mineral additives obtained on the basis of sprat waste hydrolysates. Comparative experiments have been carried out on the cultivation of whitefish fry for 56 days using experimental feeds in an RAS installation with six aquariums. Positive results have been obtained in terms of physiological and growth parameters in the experimental groups of fry relative to the control ones. In the experimental groups of whitefish, there were higher rates of body weight gain, survival, specific growth rate with a decrease in the feed coefficient. The conclusion is made about the rationality of obtaining hydrolyzates of sprat waste and their use as feed additives in the composition of feed for salmon. It is recommended to continue biological experiments with a further increase in the dosages of these additives and conduct appropriate morphobiological and hematological studies.

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