Influência de diferentes densidades de estocagem sobre o crescimento do Litopenaeus vannamei e caracterização do sedimento e solo dos viveiros

Abstract

They were developed cultivos of Litopenaues vannamei in 3 densities, 15, 20 and 30 camarões/m2 (treatments A, B and C) in nurseries of 1ha, Unit of Bahia Pesca Fisheries State Company. The objective Evalued the performance of the sea shrimp at different densities, and the characteristics of the attributes of the soil of these ponds. The experiment was accomplished in a completely randomized design, with 3 treatments (densities) and 3 repetitions (cycles) separate in the time. Post-larvas with weight and length begin of ± 0,05g and ± 0,83 mm were cultivated in the period from June 2005 to Octubre 2006. Weekly the hidrológicos parameters had been analyzed: pH. Tº, O2, NH3, N-NO2, N-NO3, So% and carried through biometria of the shrimps. The biométricos data had been submitted to the regression, test of Tukey and used in the curves, of growth, weight and growth x weight. One collected 10 samples of the ground in depth of 1, 0-10 and 10-20 cm in each fishery, before and after each culture to determine the grain sized fractions, pH and texts of organic matter, C, P, N, S, C:N, Ca+, Na+, K+, Al+3, CTC, SB e V%. The water quality parameters stayed stable. The higher weight gain over largest profit weight in relation to a same length were presented by the treatments A and B. For all the treatments, the weight profit presented inverse relation to the density. One verified better taxes of survival in the treatment, diminishing in all the treatments with the increase of the density. The C.A taxes had been of 1,4 the 2,03:1. The analysis of sediments, soils of treatments A, B and C, showed various textures, ranging from the free sandy clay, sand from the clay and sand in the sandy clay free treatments A, B and C respectively. There were differences in the concentrations of P and Corg in the treatments, and for most of the chemical attributes between the layers according to the density and the constitution textural of the soil.