R. Bras. Zootec.01/Jul/2001;30(4):1150-8.
Economic stocking viability of common carp fingerlings (Cyprinus Carpio Var. Specularis) under high density during the winter
DOI: 10.1590/S1516-35982001000500003
The objective of this research was to study the economic effect of fingerlings I common carp (Cyprinus carpio L.) population stocked in high densities on winter time with artificial supplementation and chemical manuring. A completely randomized design with four treatments (5; 10; 15 and 20 peixes/m2) and nine replicates. The fishes were stoked with average weight of 0.48 g and length. and 3.15 cm respectively in all treatments with 45 days of age. The diets were formulated with 27% PB and 2925 kcal/kg of ration, fed twice a day, in the amount of 3% of the live weight. The behavior of the treatments was studied through the regression analysis. The results for the length and final average weight in the densities of 5; 10; 15 and 20 were 8.67, 8.06, 7.81 and 7.47 cm and 3.64, 2.80, 2.31 and 2.25 g, respectively. The behavior of the weight showed quadratic regression model and the equation that best explains is Y = 4.41 – 0.29 X + 0.0077X2. The behavior of the length and feed:gain ratio showed lineal regression model and the equations that best explains them are Y = 5.83 – 0.077X and Y = 0.9978 + 0.0844X respectively. The survival was of 98.41, 97.61, 97.35 and 97.21% respectively, in the densities from 5 to 20. In similar conditions, all the studied densities can be recommended and the lucrativity of this activity is economically growing with density increase, occurring a medium or unitary cost decrease.
Keywords: common carp; Cyprinus carpio L; density; fingerlings; stock; winter