Cultivo do camarão Penaeus monodon (Fabricius, 1798) em sistema de bioflocos e fertilização inorgânica na fase de pré-engorda em ambiente de mancha branca

Abstract

Biofloc system is seen as a new strategy of illnesses prevention in cultivated Organisms and this improves productivity. This study aims at assessing inorganic fertilization system and Biofloc system as an alternative of cultivation of type Penaeus monodon Prawns in white spots environment at the pre-fattenning phase. The study was carried out at Aquapesca company, in Inhassunge District. Tanks with 40.000L capacity were used, which were also populated with 150.00 postlarves (PL18) of type P. Monodon prawns, at a density of 4PPL’s/m3 and fed by salt artemia, a balanced commercial ration (PL300 and S1), with raw protein of 30% during a period of 30 days. Zootechnic paramiters have been determined and physic-chemical paramiters of water quality. Treatment of biofloc (TB) showed to have had an improved zootechnic performance, with an avarage weight of 0,0299g (p>0.05) vs 0,0260g of the inorganic fertilization treatment (FI). Growth was of 0,0048±0.0035 for TB and 0,003±0,009 for FI. Survival was of 81% for TB and 85% for FI. Final Biomass was of 123,36g for the TB and 155,48g for FI. Parameters of water quality were within the confort mark for type Penaeus monodon prawns cultivation: Saltiness was of 35.2±1.3‰ for TB treatment and 33±0.61‰ for FI treatment; Temperature was 24.8 ±1.3 ºC (morning) and 27.4±1.4 ºC (afternoon) for FI treatmentand e 26.2±0.89 ºC (morning), 27.1±0.79 ºC (afternoon) for TB; OD was of 6.13 ±0.84 mg/L (morning), 6.0±0.51 mg/L (afternoon) for (FI) and 6.05±0.41 mg/L (morning) for TB, and 6.7±0.83 mg/L (afternoon) for TB; pH 7.9±0.76 for TB and 9.1±0.5 and 8.0 ±0.73 (morning and afternoon). Total ammonia was 0.3±0.29 mg/L for FI and 0.27±0.31 mg/L for TB. The study demonstrates that the system of cultivation in biofloc, allows to obtain better results of zootechnic performance of prawns P. monodon during the pre-fattening stage.