The effect of partial harvest on production and growth performance of Litopenaeus vannamei reared in biofloc technologic system

Abstract

The purpose of this study was to evaluate the effect of partial harvest management on Litopenaeus vannamei reared in BFT system. The experiment lasted for 154 days and it was divided in four experimental treatments according to the number of partial harvests. Treatment H0 had no partial harvest, H1 had one partial harvest (50% of total biomass), H2 had two partial harvests (33% of total biomass each), and H4 that had four partial harvests (20% of total biomass each). The shrimps were kept at optimal water quality conditions and were feed three times a day with commercial feed. The results of production parameters such as final weight 16.1 g (H0), 18.9 g (H1), 18.5 g (H2) and 20.1 g (H4), survival 43.67% (H0), 82.7% (H1), 86.6% (H2) and 84.7% (H4), and yield 3.48 kg.m−2 (H0), 5.85 Kg.m−2 (H1), 6.22 kg.m−2 (H2) and 6.14 kg.m−2 (H4) demonstrate significant differences among treatments. These results suggest that the partial harvest management in BFT system can leverage productivity.