Ionica (Bancu) Enache

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THE INFLUENCE OF GENETIC VARIABILITY ON THE GROWTH PERFORMANCE OF COMMON CARP IN A RECIRCULATING AQUACULTURE SYSTEM

Ionica (Bancu) Enache, V. Cristea, Lorena Dediu, T. Ionescu, Corina (Badalan) Sion, Georgiana Petronela (Sandu) Călin, L. Oprea, Daniela Cristina Gheorghe

Abstract
The paper is presenting some aspects regarding the influence of size on the breeding of 14-month common carp, in a recirculating aquaculture system. The experiment lasted 38 days, in four breeding units of 500 liters in volume each. Four types of variants were compared: V1-with a stocking density of 443 fish and a body weight of 44,45 g/fish (initial biomass of 39,38 kg/m3); V2- with a stocking density of 307 fish and a body weight of 63,85 g/fish (initial biomass of 39,21 kg/m3; V3- with a stocking density of 217 fish and a body weight of 89,98 g/fish (initial biomass of 39,05 kg/m3); V4- with a stocking density of 138 fish and a body weight of 141,5 g/fish (initial biomass of 39,05 kg/m3). The technological indicators that showed up at the end of the experiment revealed the following: the biomass gain in V1 was of 9,03 kg/m3, 9,67 kg/m3 in V2, 12,19 kg/m3 in V3, and 12,88 kg/m3 in V4; the specific growth rate (SGR) was of 0,54 g%/day (V1), 0,58 g%/day (V2), 0,71 g%/day (V3) and 0,75 g%/day (V4); the feed conversion ratio (FCR) was of 2,24 g pellets/g biomass gain (V1), 2,09 g pellets/g biomass gain (V2), 1,66 g pellets/g biomass gain (V3) and 1,57 g pellets/g biomass gain (V4). The research showed that common carp has a very good technological adaptability. The best growth performance was achieved in the variant with a smaller stocking density and a higher fish size.

Key words: common carp, size, RAS