THE INFLUENCE OF LIGHT INTENSITY ON THE GROWTH PERFORMANCE OF COMMON CARP IN A RECIRCULATING AQUACULTURE SYSTEM CONDITION

Ionica (Bancu) Enache, V. Cristea, T. Ionescu, Lorena Dediu, Angelica Docan

Abstract
The paper is a presentation of aspects regarding the influence of light intensity on growth carp (Cyprinus carpio L.), breeding in a recirculating aquaculture system (RAS). The experiment covered a 28 day-period, was made in four pilot rearing units, 500 litres in volume/unit. Two kind of light intensity variants were compared, with repetition: in first variant we used 280 lx luminosity and in the second version 90 lux. The stocking density was about the same in all variants: 70,5 kg/m³. The technological indicators that showed up at the end of the experiment revealed the following: the biomass gain in V1 was 21,75 kg/m³. and 20,57 kg/m³. in V2; the specific growth rate (SGR), calculated as a mean value on the two repetitions of each variant, was 0,895 g%/day (V1) and 0,845 g%/day (V2); the feed conversion ratio (FCR), calculated as a mean value on the two repetitions of each variant, was of 1,45 g pellets/g biomass gain (V1) and 1,535 g pellets/g biomass gain (V2). The research showed that common carp has a very good technological plasticity in relation to light intensity. The growth performance parameters showed that variation of light intensity did not influence significantly fish growing.

Key words: carp, light intensity, RAS