Densidade de estocagem de lambari do rabo amarelo (Astyanax altiparanae) em sistema de recirculação de água

Abstract

The objective of this study was to identify the best stocking density that provides the best performance for the creation of Lambari of the yellowtail (Astyanax altiparanae) in a closed system with water recirculation. The work was carried out in the Nutrition Laboratory of the Fishery Sector of the Agricultural Sciences Center of the Federal University of Paraíba, from April 27 to June 11, 2018. Twenty-six water boxes of 0.26m³ were used in an area of 60 m². 2,744 animals were allocated, divided into 3 densities (150 Lambaris / m³, 500 Lambaris / m³ and 720 Lambaris / m³) for males and females. The water quality was analyzed throughout the experiment, and the following variables were measured: temperature (ºC), dissolved oxygen (mg / L), pH and ammonia (mg / L) weekly. The feed management consisted of commercial feed with 32% CP, extruded, where the animals received daily 5% of the total biomass in feed during the 42 days of the experimental period, subdivided into three daily treatments at 8, 12 and 16 hours. The experiment was evaluated in a completely randomized design (DIC), with 2 sexes, 3 densities and 4 replications, totaling 24 plots. Statistical analysis of the data was performed by analysis of variance, using the Tukey test at 5% of significance, with the aid of the SAS statistical program. For lambari males of the yellowtail, it was observed that there was a weight gain during the 42 days of experimentation, however there was no significant effect among the densities at all weighings. For females, it was observed that there was a significant effect among the densities of all weighings, being that of 150 / m³ that presented better performance in weight gain. It was concluded that the storage density of 150 μm had better weight gain results, under the conditions tested, for Lambari females of the yellow tail (Astyanax altiparanae)