INFLUENCE OF STOCKING DIFFERENT DENSITIES ON DEVELOPMENT OF COMMON CARP (Cyprinus Carpio L) FINGERLINGS DURING GROWTH STAGE I AT CURITIBANOS, SANTA CATARINA

Abstract

The aim of this study was to verify the development of common carp (Cyprinus carpio L.) fingerlings during the growth stage I in different densities. The experiment was carried on nine earth ponds with an area of 70 m² each one. The experimental design was completely random with three treatments (5, 10, 15 fingerlings per m²) and three replications, using the T test to verify if there is a significant difference among the treatments. The stocked fishes had 0.76 g of mean body weight and were 100 days old. The diet was formulated with 34% crude protein and 2,925 kcal/kg of powder ration, and given once a day at a rate of 3% of total biomass. The average results obtained were: weight (g) 7.37; 4.15 and 3.92; length (cm) 6.68; 5.25 and 5.32; feed conversion rate 2.06; 2.59 and 2.77, and survival (%) 66.86; 66.98 and 65.16, for the treatments 5, 10 and 15 fingerling/m², respectively. The result of T test application (P<0.05) shows that the weight, length and feed conversion rate variables do not differ in the 10 and 15 fingerling/m² treatments. For the survival variable there isn't a significant difference among the treatments. In similar conditions, the 15 fingerling/m² density was recommended in order to obtain bigger quantities of fingerlings in stage II or a 5 fingerling/m² density in case of intending to obtain fingerlings with bigger weight and size.