Adoção tecnológica (densidade de estocagem) no cultivo de peixes em tanques rede, fase alevinagem no Açude do Rosário Quitaiús/Lavras da Mangabeira/CE / Technological application (stocking density) in fish farming using net-tank system, fish hatchery in the Rosário Quitaiús dam, Lavras da Mangabeira, State of Ceará, northeastern Brazil

ABSTRACT

This research focused on monitoring the farming early stage (nursery) of the Chitralada strain of Nile Tilapia (Oreochromis niloticus) in a dam using net-tank system. This farming was done by an enterprise association in the district of Quitaiús, municipality of Lavras da Mangabeira, in the South-Central region of the state of Ceará. The fingerlings with weight of 1 gram were farmed for 50 days until they reach their final weight of 56 grams. After that, they were transferred to farming cages at a stocking density of 1,000 fingerlings. After testing empirically several densities, the stocking density of 416.6 per m3 for nursery cage of 4.8 m3 (2.0 x 2.0 X 1.2m), totaling 2,000 fingerlings per cage, showed the best performance in the average weight. At this farming stage, a powdered chow diet composed by 55% of crude protein was taken in 10 daily meals observing the same time interval.