Efeito da aeração artificial suplementar sobre a produtividade do tambaqui (Colossoma macropomum) em sistema sem fluxo contínuo de água

Abstract

This study aimed to evaluate the effect of aeration additional artificial about the performance and economic viability Tambaqui cultivation (macropomum Colossoma) System without flow followed by water. In design for independent samples was used 8 semi-excavated ponds of 0.32 ha populated with 5,000 juveniles tambaqui with average initial weight of 11.8 ± 8.0 and ± 3,02g 3,1cm long pattern. The treatments were: T1 - 4 semi-excavated ponds endowed with aerator 1.0 CV power surface spray operating at night between 18:00 and 06: 00hs; and T2 - 4 semiescavados nurseries devoid of artificial aeration. The experiment lasted 120 days. husbandry variables of final average weight were evaluated gain weight, feed conversion and survival. They were also conducted analysis of the cost of production and profitability, cash flow and determining the net present value of indicators, internal rate of return, payback period of capital and sensitivity analysis with variation economic scenarios selling price and production volume. There was significant difference (p <0.05) in the productive performance of animals among treatments. Still, improvements were verified in aeration treatment, so that the average final weight was 345.20 ± 84.78 and treatment T2 268,67g ± 87.60. The feed conversion in was more efficient in the treatment with supplementary artificial aeration (T1), and 0.89 while the control treatment (T2) was 1.19. At economic evaluation, the value of net present - NPV, internal rate of return - IRR and capital recovery period - Pay Back, also presented better performance when using additional artificial aeration