Parâmetros hematológicos do lambari do rabo amarelo (astyanax altiparanae) sob diferentes níveis de salinidade da água

Abstract

Lambari is considered as a species with great potential for exploitation in the sector, due to it s particularities as its high prolificity, captive breeding and commercial feed consumption. The objective of this study was to evaluate the performance of yellow tail lambari fingerlings (Astyanax altiparanae) at different salinity levels to evaluate zootechnical performance and hematological parameters. The experiment was conducted at the Nutrition Laboratory of the Fish Farming sector of the Center for Agricultural Sciences of the Federal University of Paraíba, Areia-PB, from September 2 to November 23, 2021. It was used aquariums with a useful volume of 50 liters, with 10 animals per aquarium, totaling 160 animals. The fish were selected within an average weight ranging from 0.22 g to 0.25 g and length of approximately 1 cm. The different salinity levels used were 0 ‰, 2 ‰, 4 ‰ and 6 ‰, distributed by a completely randomized design. To raise 1‰ in a liter of water, it was necessary 2,872 g sea salt without iodine. The adaptation period was seven days before the beginning of the experiment. The aquariums were handled weekly, with a change of 30% of the water volume of each aquarium, as well as measurement of temperature, salinity and pH. The food management was carried out with commercial diet containing 32% CP, crushed at 1mm, being supplied three times a day at 9, 12 and 15 hours. Three biometrics were performed during the project, which was at the beginning, with 30 days and with 56 days. In the last biometrics, blood collection was performed to perform hematological tests. There was no difference in zootechnical performance and hematological parameters, suggesting that lambaris were not influenced by salinity. These data ensure that lambaris fingerlings can be introduced at 21 days post-hatching in different salinity water without risk of mortality and without impairing their performance.