The technology of growing rainbow trout in the conditions of PE “Western Fish Company” by feeding Vita Fisch compound feed

Abstract

A study was conducted on feeding Vita Fisch combined feed to rainbow trout Oncorhynchus mykiss this year based on a full-system cold-water farm of the Western Fish Company, Peremyshlyan district, Lviv region. The experiments considered the conditions of keeping hydrochemical and fishery indicators: stocking density, temperature, oxygen saturation, and pH of the environment. At the initial stages of the work, fish pools with a water volume of 30 m3 were treated by a one-time application of the probiotic “Sviteco PW” at a dose of 1.0 ml/m3 of water. According to our observations, after a day, the water in the pool became more transparent compared to collections without probiotics, which indicates high results of bioremediation, which maintains the water body at an optimal level. By conducting production tests on this year's troy ear we set ourselves the goal of producing high-quality, high-nutrition combined feed with a low cost and feed ratio, which are well eaten by fish, contribute to the appropriate growth rate, increase fish weight, profitability of aquaculture, prevention of water pollution, reduction of manifestations of conditionally pathogenic microorganisms and safety for the environment. Therefore, we fed this year's raiyear'srout with “Vita Fisc” granular compound feed, which is made from domestic ingredients according to a recipe for young trout, in specialized production by fermentation of the main components of the meal with the introduction of 2.5 % of the premix and probiotic “Sviteco PWC” production pools under aquaculture conditions at the 0.7 ml/kg feed. The ingredients and production of this feed are focused primarily on quality indicators regarding environmental friendliness and environmental protection, taking into account health, physiological state, the ability of fish to carry loads, the quality of food fish, and the profitability of production. Feeding with combined feed was carried out at a temperature of 8 °C while providing 1 % of the feed from the weight of the fish during the day. As a result of the work, trout have a high activity in eating, digestibility, assimilation of compound feed, and a low feed coefficient of 0.95 k. units were established.