EXPERIMENTAL NURSING OF COMMON CARP FINGERLINGS (Cyprinus carpio) BY USING BIOFLOC TECHNOLOGY AT DIFFERENT STOCKING DENSITIES

Abstract

Stocking density is a key factor in aquaculture. This study was conducted to investigate the water quality, growth, survival rates and feed conversion ratio (FCR) when nursing Common carp fingerlings (Cyprinus carpio) by using biofloc technology with different stocking densities. Common carp fingerlings (35.57 ± 1.37 g/fish) were randomly stocked in 9 tanks (270 L/tank), with three experiments as: BFT100 (100 fish/m³), BFT150 (150 fish/m³) and BFT200 (200 fish/m³) were nursed in biofloc system with molasses as a carbon source with C/N ratio of 20/1. Fish was fed on demand with 35% protein diet. The result showed that after 60 days nursing water quality in BFT100 was maintained better than that in BFT150 and BFT200. The survival rate (97.53 ± 2.14%) and average daily weight gain (0.73 ± 0.04 g/day) of common carp in BFT100 were highest compared with the other treatments. Common carp in BFT100 had the lowest FCR (1.48 ± 0.01) (P <0.05) compared to BFT150 (1.55 ± 0.02) and BFT200 (1.69 ± 0.04).