EFFECT OF STOCKING DIFFERENT DENSITIES ON DEVELOPMENT OF CYPRINUS CARPIO (L.) FINGERLINGS DURING GROWTH STAGE I IN RIO DAS ANTAS, SC

Abstract

The aim was to test several fingerling densities for full development of carp (Cyprinus carpio L.) during its growth stage I. The experiment was carried on six earth ponds with an area of 200 m² each one. The experimental design was CR with three treatments (15, 30 and 45 fingerlings per m²) and two replications, using the T test to verify if there is a significant difference between the treatments. The fishes were stocked with 2.01 g of mean body weight and 90 days of age. The diet was formulated with 34% crude protein and 2.925 kcal/kg of powder ration, and given once daily, at a rate of 3% of total biomass. The average results obtained were: weight (g) 2.66; 1.87 and 1.42; feed conversion rate 4.05; 4.29 and 4.39; survival (%) 86.97; 74.89 and 75.48; length (cm) 5.85; 5.53 and 5.39, for the treatments 15, 30 and 45 fingerling/m², respectively. The result of T test application shows that the weight variable at 15 and 45 fingerling/m² density differed, at 5% of probability, from the 30 fingerling/m² density. For the length variable there was a difference between the 15 and 45 fingerlings per m² density, only in the last evaluation, showing that this factor only begins to interfere after 90 days of age. For the survival variable, the 15 fingerling/m² density differed from the others, while the feed conversion rate variable didn't show a significant difference among the treatments. In similar conditions, the 45 fingerling/ m² density is recomended in order to obtain bigger quantities of fingerlings in stage II or a 15 fingerling/m² density in case of intending to obtain fingerlings with bigger weight and size.