Estudio de la densidad óptima para la crianza de tilapia roja (Oreochromis sp) en la parroquia Fátima, provincia y cantón Pastaza.

Abstract

The objective of this research was to determine the optimum density for the rearing of red tilapia (Oreochromis sp.), under three stocking densities 4-6 and 8 fish/m2, in Fatima Town, Province and Canton of Pastaza. The research used 12 experimental units consisting of 2 m2 ponds with a total area of 24 m2 in which different stocking densities were applied (4-6-8 fish/m2) with a total of 144 fish. They were the observational units. The experimental work lasted 90 days. The animals were grown under the same environmental, nutritional, and sanitary conditions. The treatments were distributed in a Completely Randomized Design (CRD) with a total of three treatments with four replicates per treatment. Descriptive statistics were used for the variable’s mortality, unit cost of production and Benefit/Cost Ratio ($). Field-estimated data were subjected to analysis of variance (ADEVA), separation of means by DGC with a significance level of (P≤0.05). The results determined highly significant differences (P≤0.01) in the analysis of variance for final weight with 13.61 g, weight gain of 12.64 g and the lowest feed conversion of 2.98 g. It was estimated that the best results were in treatment T3 (8 fish /m2). No statistical differences (P≥0.05) were recorded for initial weight with an average of 0.97 g and feed consumption. Treatment T3 recorded the highest consumption with 37.66 g which obtained a better feed conversion, the mortality estimate was 3,13%. It was concluded that the best seeding density is 8 fish/m2 corresponding to treatment 3 and it is recommended to carry out studies using this seeding density as a basis and to include in the experimental analysis physicochemical factors of the water, to use fertilization and to establish physiological stages of experimentation.