Using of dry biomass of methanotrophic bacteria for enrichment of starter artificial feeds when growing juveniles of broad whitefish Coregonus nasus (Pallas, 1776)

A research was conducted to study the effect of starter artificial feeds enriched with dry biomass of methanotrophic bacteria ( Methylococcus capsulatus ) and a complex of fatty acids on growth, survival, fish productivity, feed conversion efficiency and the biochemical composition of tissues juveniles of broad whitefish ( Coregonus nasus ). Using of an experimental diet (10 % microbial protein, linseed oil, premix drug “Arfit”) made it possible to increase the growth rate of juveniles of broad whitefish. The final weight of fish in the experiment was 17.2% higher than the control. The condition factor was 3.1% higher compared to the control, fish productivity was 13.0% higher, and there was a 4.0 % decrease in feed costs for ichthyomass gain. At the end of the experiments the content of crude fat and crude protein was higher by 12.4% and 3.0%, respectively, compared to the control. The total content of amino acids in the tissues of juveniles of broad whitefish, when microbial protein and a complex of fatty acids were added to the diet, increased by 5.4% compared to the control.