Replacement of fishmeal for protein components of microbial, animal and plant origin in feed for two-year-old whitefish (Coregonidae)

Abstract

The purpose of the work: To determine the possibility of replacing fishmeal with other protein components in the composition of feed for two-year-old whitefishes.Methods used: whitefish were grown in cages on experimental, control and imported feeds during the growing seasons of 2018, 2019 and 2020.The growth rate of fish and the physiological state of the liver index, blood parameters, total fat and vitamin C content in the body and liver were studied.Novelty: the use of new domestic protein components in feed for whitefishes — microbial protein concentrate (bacterial biomass on natural gas), Agro-Matike (a mixture of legume components with meat flour — processed products of poultry farms), Protefid (soy concentrate).Results: Two-year-old whitefish fed feed with the replacement of 30–50% of fishmeal with the indicated protein components did not differ in growth rate from the growth rate of fish reared on control feeds without of fishmeal substitutes, but lagged behind in growth from fish fed on imported feed. With an increase in the composition of experimental feeds of fish oil from 14–16 to 20–22%, the final weight of whitefish reached the weight of fish on the Finnish feed. The physiological state of fish on all variants of feed did not deviate from the norm.Practical significance: the mastered production of Agro-Matik, Protefid and the possibility of increasing the production of microbial protein concentrate make it possible to use them as substitutes for fishmeal in the composition of complete feeds for industrial fish farming.