Developing extruded production compound feed technology for fish grown in industrial conditions

The purpose of the study is to develop domestic recipes for production feed for valuable fish species (zander, jade perch, pike) grown in recirculating water supply units (UZV), and to work out the technological regimes for the production of feed by extrusion. Tasks - to establish the nutritional value of feed for valuable fish species (zander, jade perch, pike), develop recipes and develop experimental batches of production feed, establish their chemical composition, physical and technological properties, determine the effectiveness of the use of the developed feed for fish breeding and biological indicators in fish farms. The objects of study are extruded feed for zander, jade perch, pike, developed by the Kazakh Research Institute of Processing and Food Industry. In the developed experimental batches of feed, the chemical composition was determined, the following results were obtained, %: the protein content in the feed for zander - 44.83, for perch - 42.77, for pike - 41.84; crude fat - 14.96; 15.21; 14.23, lysine - 2.87; 2.6; 2.4, methionine + cystine - 1.52; 1.52; 1.33, phosphorus - 1.52; 1.54; 1.63, crude fiber - 2.17; 2.4; 2.58 respectively. The volumetric weight index in all three types of mixed fodder is less than 600 kg/m3, the angle of repose is 29.5 degrees, the feed coefficient when feeding zander is 1.8 units, perch is 1.5, and pike is 1.9 units, fish survival was normal. The established technological indicators indicate that the produced extruded fish feed is a good technological product that meets the requirements of regulatory and technical documentation. The developed recipes and technology for the production of mixed fodder can be recommended for use at domestic feed mills in the development of production mixed fodder from local raw materials for feeding and rearing underyearling of zander, pike, and jade perch under industrial conditions.