Aspects Regarding the Ornamental Japanese Carp Rearing into Recirculating Systems Conditions

Aurelia NICA, Lorena DEDIU


To test the effect of different stocking on their growth, survival rate and number of marketable fish, juveniles ofkoi carp (0.4 g), Cyprinus carpio vr. Koi were cultured for 30 days in 200 L aquariums with densities of 150 exemplarsand 300 exemplars respectively. Experiment was conducted in a recirculating system equipped withindependent units for mechanical and biological filtration. At the end of the experiment, the data wereprocessed in order to develop a model of growth and determination of the appropriate equation. In terms ofgrowth, Anova test reveals significant differences among the four experimental groups regarding individual finalweight, which is determined by the variability of the populations tested intragroup variability as evidenced bythe coefficient of variation (>50% for all experimental variants) and the distributions of individual body weightevidenced by the chart type “box and whiskers†which can be seen a large number of extreme values. Technologicalefficiency did not follow a pattern directly correlated with stocking density, so the differences are practical dictatedby the heterogeneity of the population, which has resulted in significant differences in size between individualsand the manifestation of the phenomenon of cannibalism. More researches are still needed to further optimizestocking density of Japanese Ornamental Carp in recirculating system.


density, ornamental carp, recirculating system

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