Estratégias de manejo para aclimatar o camarão marinho Litopenaeus vannamei (Boone,1931) à água doce

Abstract

Experiments had been carried in the Laboratory of Shrimp culture of the Fishery Department of the Federal Rural University of Pernambuco (UFRPE), the purpose to acclimatize post larvae of the marine shrimp Litopenaeus vannamei to freshwater, during the period of 2003 at 2004. The experiments had been carried through in three phases, using post larvae with nine and ten days (PL9-10) and post larvae with twenty five and twenty six days (PL25-26) produced by commercial hatcheries. The acclimatization had been developed in aquariums with capacity of 44 liters each where the post larvae had stocked a density 11,3 PL/L, of with an acclimatization average time of of ten days.In first experiment had been tested concentrations lime, associates with the renewal rate daily of water of aquariums. In second experiment had been tested the concentration of lime and diets with two levels of artemia and artificial feed for shrimp. At the third experiment five diets with levels different of artemia, artificial feed for fish and artificial feed for shrimp had been tested. In the end of acclimatization in three experiments, post larvae had removed of the aquarium, counted, measured and weighted to calculate the survival, final weight, weight gain, final length and length gain. At first experiment the renewal rate of 50% daily of water de 50% were more efficient at post larvae parameter growth. In second experiment, diet D1 provided best survival than diet D2 (P < 0.05). While in third experiment, the survival rates were best to make useful artificial feed for fish. As conclusion, the water ofrenewal rate and diets had influenced significantly (P<0,05) on zootechnical data of these specie.