Protocolo para criação intensiva de juvenis de tilápias oreochromis niloticus em tanques rede em um reservatório subtropical

Abstract

The formation of juvenile tilapia Oreochromis niloticus in cages in subtropical reservoirs is an alternative to optimize the annual rearing cycles. The aim of this study was to propose a production protocol for juvenile tilapia O. niloticus reared in cages in a reservoir of a hydroelectric dam on the Iguaçu river during winter - spring. The experimental period was from April to October 2013, and 150,000 fingerlings were used with an average weight of 3.0 ± 0.5 g, distributed in 8 cages with volume of 27 m³. The water temperature was 21.1 ± 1.8 ° C. Sampling was done every 15 days to calculate and adjust the amount of feed offered to the animals. The diets were offered: mash diet with 45% crude protein (CP), then extruded diet with 38% CP (2 mm) and diet with 32% CP (3 mm). The survival of juveniles was 76.42 ± 7.2%. The final mean weight was 142.37 ± 12.6 g, and the cost per kg of fish was R$ 4.54 reais. The proposed protocol optimizes the aquaculture production of tilapia in the reservoir, indicating the period from May to October for training of youth and the period from November to April for fattening of fish in order to reduce the negative impacts caused by seasonal temperature reduction water.

Keywords

• Aquaculture
• fish farming
• water temperature