Effect of food frequency in the nursery phase of the super-intensive white shrimp culture Litopenaeus vannamei in a biofloc system
Currently, with the intensification of aquaculture systems, the biofloc system appears as a sustainable alternative to supply the market's demand for shrimp. This system is based on crops with high stocking densities and smaller areas for cultivation. Within this context, food frequency is an extremely important management tool, as the largest expenditure on shrimp production comes from feeding. The present study was carried out at the Marine Aquaculture Station, IO-FURG and evaluated different feeding frequencies in the nursery phase in the bioflocals system: T1 (1 feeding/day); T3 (3 feeds/day) and T6 (6 feeds/day), both with three repetitions. In a greenhouse with nine 35 m2 tanks, 72 post-larvae of Litopenaeus vannamei with an average weight of 0.033g were stored,in the stocking density of 2000 shrimp m-273. Parameters of water quality, zootechnical performance, microorganisms and histological analysis of the shrimp were monitored. The experiment lasted 40 days. The data on water quality, final weight (0.90; 1.03; 1.04g), survival (91; 80; 78%) and CAA (1.46; 1.23; 1.43) did not differ between treatments (p> 0.05). The results obtained show that it is possible to reduce the feeding frequency in the nursery phase, since its increase does not alter the water quality and does not affect the zootechnical performance of the cultivated shrimp.