Recria de pirarucu (Arapaima gigas) em tanque-rede revestido com lona de polietileno preta para controle de temperatura

Abstract

The research aimed to analyze the development of pirarucu in the juvenile phase raised in cage, in Uberlândia/MG, through simple technology in order to ensure proper temperature for its good performance. This study evaluated the growth of 30 pirarucus for 69 days until the juvenile phase (second growth phase) in the fall and winter season of the southern hemisphere using nurseries, in a cage (3x3x1,5 m) coated with black tarp in order to increase and maintain the temperature inside the tank in ideal conditions for the cultivation of pirarucu. The temperature of the external environment, inside environment the tank and water were measured on a daily basis. At the end of the experiment, the weight and lenght of the juveniles were evaluated. The average internal temperature of the tank was higher in relation to the external environment showing higher temperatures in the month of May (28,5ºC) and June (28,6ºC). The water temperature remained betwen 20ºC a 22,5ºC. Thus, the canvas structure did not provide the ideal temperature for the cultivation, influencing the low daily weight gain (0,42 grams), making the culture impracticable, and the survival rate stayed at 96,6%.