Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 2
Written by Aurelia NICA, Alina MOGODAN, Ira-Adeline SIMIONOV, Stefan-Mihai PETREA, Victor CRISTEA
The identification of suitable fish stocking density proves to be essential in order to elaborate a sustainable fish rearing technology. The aim of present study is to identify a proper stocking density for juvenile ornamental carp, that maximizes the productivity of this specie, in semi-intensive aquaculture production systems. Thus, two ornamental carp stocking densities were tested, in duplicate (V1 – 6.3 kg/m3, respectively V2 – 7.01 kg/m3). The results indicate a better feed conversion ratio (FCR) in case of V1, compared to V2. Also, V1 registered higher specific growth rate (SGR) values and a better protein efficiency ratio (PER). However, in order to maintain the technological water quality within the optimum range for rearing ornamental carp, a higher water exchange rate was applied at V2, compared to V1, especially in the first part of the experimental period. The FCR registered better values in the first part (1.5% feeding ratio was applied), compared to the second part of the experimental period (1% feeding ratio). However, if production maximization is required, higher ornamental carp stocking densities and feeding ratio can be applied if water quality module will be improved.
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