Acute toxicity of nitrate on Penaeus monodon juveniles at different salinity levels

Su-Jun Tsai, Jiann-Chu Chen-2002
Aquaculture, 213(1-4): 15-29
Abstract :

Penaeus monodon juveniles (total length 28.4±6.2 mm) were exposed to different concentrations of nitrate–N (nitrate as nitrogen) using the static renewal method at different salinity levels. The 48-, 72-, 96-h LC50s (median lethal concentrations) of nitrate–N for P. monodon juveniles were 2876, 1723, 1449 mg/l in seawater of 15 ppt (g/kg); 3894, 2506, 1575 mg/l in 25 ppt; 4970, 3525, 2316 mg/l in 35 ppt, respectively. The "safe level" for rearing juvenile P. monodon was estimated to be 145, 158 and 232 mg/l nitrate–N in 15 ppt, 25 ppt and 35 ppt, respectively. The relationship between LC50 of nitrate–N (mg/l), salinity (S), exposure time (t) and the interaction between salinity and exposure time (St) is as follows:

LC50=3917.467+102.456S-42.634t-0.342St (R²=0.775)

(Department of Aquaculture, National Taiwan Ocean University, Keelung, Taiwan, 202, People's Republic of China, e-mail of Jiann-Chu Chen: jcchen@mail.ntou.edu.tw) 

home