RESULTS ON THE PATTERNS OF GROWTH AND MORPHO-PRODUCTIVE INDICES OF RAINBOW TROUT (ONCORHYNCHUS MYKISS) REARED IN TWO DIFFERENT SYSTEMS

D. Cocan, Vioara Mireşan, Camelia Raducu

Abstract
The purpose of this study was highlighting reared systems on growth rhythm and morpho-productive indices in rainbow trout (Oncorhynchus mykiss). The biological material was represented by a rainbow trout population, divided into two groups of 400 individuals per groups. The first group was exploited in a classic growth system (Fiad trout farm, Bistrita-Nasaud county), and the second group was exploited in a recirculating system. Initial average weight was 22.69 ± 0.65 g for group exploited in recirculating system, and 22.71 ± 0.25 g for the group exploited in the classical system. At the end of the study, average weight of trout exploited from the recirculating system was 317.78 ± 9.39 g, respectively 102.28 ± 2.56 g for trout of classical system. Feed used during the study was the same for both groups. It was found that the recirculating system is advantageous in terms of growth rhythm and morpho-productive indices, because at the end of the study, trouts have reached the market weight required. The morpho-productive indices studied were: slaughter yield, the share of the body components, the carcass meat yield and the percentage distribution of meat, depending on the considered anatomically segment.

Key words: rainbow trout, farming systems, growth dynamics, bioproduct indices