Особливості накопичення маси у цьоголіток і дволіток райдужної форелі

Abstract

Freshwater growing of rainbow trout is one of the main directions of production of fish products in Ukraine. Improving the technology of cultivation of marketable rainbow trout fisheries is an urgent task of fisheries’ science. The aim of research is to explore rainbow trout growth and feed efficiency in the commodity cultivation of the fish in the tank fisheries with using of river water. The recearch was conducted under conditions of farm fisheries "Sloboda-Banyliv" located in Vizhnitsya district of Chernivtsi region. The total basin area – 1100 m 2 . Water supply of tanks is river and ram. Research materials are fingerlings of rainbow trout. The fish were fed of combaned feed produced by Danish company "BioMar". The used methods are common in fish culture. The water temperature and the concentration of dissolved oxygen was measured daily. Catching of rainbow trout in tanks was every ten days with aim to determine fish growth rate and feed efficiency. There were studied peculiarities of accumulation of the mass of fish depending on seasonal fluctuations of temperature and dissolved oxygen. There was established of parameters of the aquatic environment for the most efficient storage mass of rainbow trout and the use of fish feed. Maximum grows rate and feed conversion was in the water with temperature 18 0 C and the concentration of dissolved oxygen in the water of not less than 8 mg O / liter. There has found that working conditions were favorable for tanks management and commodity production of rainbow trout for eight months. It was recommended to optimize the timing of rearing rainbow trout in this fish farm by shifting cultivation fish beginning of the season one month earlier.