Desempenho do lambari do rabo amarelo (Astyanax altiparanae) em diferentes níveis de salinidade

Abstract

With the objective of obtaining the best performance in different salinity levels of the yellowtail lambari (Astyanax altiparanae). The work was developed at the Nutrition Laboratory of the Fisheries sector of the Center of Agricultural Sciences of the Federal University of Paraíba, from April 11 to May 22, 2019.. Where 240 animals are used, 120 males and 120 females. Allocando 10 animals per aquarium. Using different levels of salinity 0‰, 2‰, 4‰ and 6‰. 0.88 g salt without iodine was used to increase 1 liter of water. The lambaris were selected by size, males with an average size of 5.7 to 6.3 cm and the mean eye size of 5.8 to 6.3 cm. The animals undergo an adaptation period of 15 days before the start of the experiment. The water quality was analyzed throughout the experiment, with the following options: temperature (ºC), dissolved oxygen (mg / L), pH, nitrite (mg / l) and ammonia (mg / L). Where an exchange of 30% of the water volume of each aquarium was performed, once during the whole experiment. The food management was composed of commercial feed with 32% CP, crushed with a size of 2 to 3 mm, the season was added daily, subdivided into three treatments at 8, 12 and 16 hours. The effectfulful limit only than effect, lambari presents sexual dimorphism. The lambari resists salinity up to 6 ‰, no difference in zootechnical performance was selected.