THE INFLUENCE OF STOCKING DENSITY ON SILURUS GLANIS (LINNAEUS, 1758) GROWTH PERFORMANCE IN A RECIRCULATING AQUACULTURE SYSTEM
Săndiţa (Ion) Plăcintă, V. Cristea, Iulia Rodica Grecu, Mirela (Creţu) Mocanu, M.T. Coadă, Alina Antache, Elena Bocioc, Şt.M. Petrea
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.
Key words: catfish, recirculating aquaculture system, stocking density, technological performance indicators