The influence of stocking density on the growth of common carp, Cyprinus carpio, in a recirculating aquaculture system.
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 2
Abstract
The paper presents some aspects regarding the influence of stocking density on the breeding of the common carp in a recirculating aquaculture system (RAS). The experiment covered a 30 dayperiod. It was conducted in four aquaculture tanks, 500 L/tank, in the recirculating aquaculture pilot system of “Dunarea de Jos” University of Galați. Two kind of stocking density variants were compared: 64 kg/m[sup]3[/sup]in V1 (B1, B3) and 32 kg/m[sup]3 [/sup]in V2 (B2, B4). The stocking density was: 491 fish in B1, average weight - 65 g/ fish; 245 fish in B2, average weight - 66 g/ fish; 211 fish in B3, average weight -152 g/fish; 107 fish in B4, average weight - 150 g/fish. The technological indicators obtained revealed the following: the specific growth rate (SGR), calculated as a mean value on the two repetitions, was 1.28%/day in V1 and 1.49 %/day in V2, indicating better growth in V2; the food conversion ratio (FCR), calculated as the mean value of the two repetitions, was 1.28 in V1 and 1.06 in V2, expressing a higher efficiency in capitalization of food in V2. The mean biomass gain in V1 was 30.46 kg/m[sup]3 [/sup]as compared to 18.55 kg/m[sup]3 [/sup]in V2, almost perfectly correlated with the stocking density. The daily growth rate (DGR) varied in a similar way, from 494.57 to 520.90 g/day in V1 and 302.4 to 315.9 g/day in V2. The experiment demonstrated a remarkable technological plasticity in both experimental variants, whereas, in terms of technological performance indicators, it was found that the application of lower stocking densities lead to higher crop biomass. The high stocking density means, therefore, large amounts of metabolic waste, removed from the breeding units through their effluent, the recirculating flow of which is 4m[sup]3[/sup]/h, enough to ensure the whole volume of water in a growth tank to be changed every half hour.
Authors and Affiliations
Ionica Enache, Victor Cristea, Tudor Ionescu, Săndita (Plăcintă) Ion
Keywords
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