<b> Acute toxicity of ammonia, nitrite and nitrate on pink-shrimp juvenile <i> Farfantepenaeus brasiliensis </i> (Latreille, 1817) (Crustacea: Decapoda) </b>

Abstract

The development of new techniques has led to the intensification of aquaculture regarded to rearing of different species. Therefore, there is a tendency to increase the generation of nitrogen compounds in these cropping systems. The nitrogen compounds naturally occur in the water of rearing systems, and may cause death or affect the individual growth. The most abundant nitrogen forms in the ponds are ammonia, nitrite and nitrate. The juveniles of pink-shrimp, Farfantepenaeus brasiliensis were exposed to different concentrations of ammonia, nitrite and nitrate. The LC50 values for ammonia, nitrite and nitrate for 24h to 96h are respectively 24.77 to 8.81mg/L, 252.04 to 105.97mg/L, 1882.63 to 912.07mg/L, respectively. The safe level of ammonia, nitrite and nitrate to pink shrimp juveniles estimated were 0.88mg/L, 10.60 and 91.21mg/L, respectively.