| ABSTRACT The present study aimed to evaluate nitrate acute toxicity in cultured common snook Centropomus undecimalis juveniles. Fish (20.35±6.10 g and 13.90±1.75 cm) were submitted to a control treatment (without nitrate addition) plus 20 increasing concentrations of nitrate up to 2735 mg L-1 obtained by sodium nitrate. System was semi-static, with 100 % daily water renewed and sodium nitrate addition to maintain the respective concentrations. Water temperature was 20.99±0.55 °C, dissolved oxygen 6.79±0.21 mg L-1, pH 8.23±0.10, alkalinity 141.80±7.68 mg L-1 CaCO3, salinity 33.47±3.75 g L-1, total ammonia and nitrite less than 1 mg L-1. During experimental period (96 h), no mortalities were observed in fish with or without nitrate addition. Compared to... |
