EFEITO DO EUGENOL NA SOBREVIDA DE LAMBARIS (ASTYANAX SP) EM DIFERENTES CONCENTRAÇÕES E TEMPERATURAS

Abstract

The present study aimed to evaluate the effect of eugenol on the lambaris survival (Astyanax sp) at different concentration and temperatures, contributing to transportations technics. Six hundred and twenty five fish with 4,28±2,75 g 6,62±1,18 cm were used. Eugenol concentrations of 7,5; 9,5; 11,5; 13,5 and 15,5 mg/L were tested at 05 replications. Each concentration was submitted to temperatures of 20, 22, 24, 26 and 28°C, totalizing 125 experimental units. Each unit received 05 fishes, wich were kept of 01 liter volume until the beginning of mortality, when the analyses of pH, ammonia, and dissolved oxygen started. The results obtained showed that the beginning of mortality, pH and ammonia were significantly influenced by the temperature and eugenol concentrations. The dissolved oxygen was influenced only by the eugenol concentration. Considering the temperature, it was registred that temperatures between 20 and 28°C caused mortality earlier than temperatures around 24°C. It was concluded that eugenol concentrations between 7,5 and 15,5 mg/L are appropriated for this specie. Besides, it was observed temperature of 24°C and eugenol concentrations in the range of 7,5 and 9,5 mg/L indicated to use in the transportation of lambari.