Modelo de gestão para criação de espécies amazônicas em sistema semi-intensivo: um estudo de caso tambaqui (Colossoma macropomum Cuvier, 1818)

Abstract

This study aimed, raising the question of what weight mix for the market, is the maximization of production for the cultivation of tambaqui (Colossoma macropomum) in semiescavad tank. It is a productive aquaculture systems widely used in semi-intensive fish farming in the north of the Amazon. Management strategies can be established to manipulate and control your production process as other cultivated species, assessing best result. In our case, two assumptions were made, HO1: Considering the density and physical-chemical parameters controlled, the product mix has no effect on the profit achieved in the final fish removal in fish production. The second, Ho2: The exit time in nursery phase does not influence the profit. On the farm, the current business volume was intended to meet the demand for refrigerators, preferring despescados fish weighing 0.5 kg. Based on the actual situation, in response to the first hypothesis, mathematical algorithm generated, were simulated with scenarios layouts to 5:10 tanks (representing small and large fish farmer), and the ability of biomass to both equal to 2400 kg, set by dissolved oxygen (OD) to the fish in the tank, the mortality rate was 1% in each stage. With premise fish removal mix weight 0.5 kg, 1 kg and 0.5 kg, 1 kg, 2 kg. And with prices for sale as follows: R $ 4.00 / kg; R $ 5.00 / kg; R $ 6.50 / kg for fish with 0.5 kg; 1 kg and 2 kg, respectively, and feed conversion ratio of 1:1, 1.2:1, 1.6:1 and the ration price R $ 1.44 / kg. Obtained for planning fish removal, the higher profitability of R $ 32,379.10 and R $ 51,846.90 respectively to the mix, to layout 10 tanks. In response to the second and following the same premise conditions for the first, but over time the pre-set nursery on "30, 40, 50, 60, 70, 80, 90, 100 days" in phase I- obtained for fish removal planning in order to maximize net income values ranging from R $ 46,930.20 to R $ 92,165.40 was for that weight mix with the nursery time of 80 and 90 days. Some limitations must be observed, since these results were not considering the continuous time horizon in phase - I nurseries, as well as gaps (time gap) between the identified successive stages being feasible for further studies