THE INFLUENCE OF STOCKING DENSITY ON SILURUS GLANIS (LINNAEUS, 1758) GROWTH PERFORMANCEIN A RECIRCULATING AQUACULTURE SYSTEM

摘要

The paper presents the aspects of stocking density influence on catfish juvenile’s growth performance in recirculating system. The experiment was made during 29th July -7th September 2011 on the pilot recirculating system of Aquaculture, Cadastre and Environmental Science Department from Food Science and Engineering Faculty - Galati. Juveniles catfish with an average body weight of 8.61 ± 0.24 g formed the biological material for this experiment. The experimental design consisted in the evaluation of two variants of stocking densities, in duplicate: first variant with a density of 2.78 kg/m3 and second variant with 1.46 kg/m3 stocking density. At the end of the experiment, the following average body weights were recorded: 31.84 g and 31.45 g at first variant, respectively 33.48 g and 34.70 g at second variant. Specific growth rate (SGR) and the feed conversion ratio (FCR), calculated as the mean value of the two repetitions is presented as follows: for V1: SGR=3.40 g%/day; FCR= 0.89 feed/g biomass growth, respectively for V2: SGR= 3.52 g%/day; FCR= 0.79 g feed/g biomass growth. The technological indicators underlay that stocking density significantly affects, (p<0.05), the mean individual body mass of tested specimens in both variants.