PT13 Aquatic Ecotoxicology I
Exhibit Hall
8:00 AM - Tuesday
(PT201) Toxicity of nitrite to Litopenaeus vannamei in water containing low concentrations of dissolved solids.
Sowers, A1, Tomasso, J1, Young, S1, Isely, J2, Browdy, C3, 1 Clemson University, Clemson, SC, USA2 U.S. Geological Survey, Clemson, SC, USA3 South Carolina Department of Natural Resources, Charleston, SC, USA
ABSTRACT- The uptake, depuration, and toxicity of environmental nitrite were characterized in Litopenaeus vannamei exposed in water containing low concentrations of total dissolved solids. In 2 g/L artificial sea salts, nitrite was concentrated in the hemolymph in a dose-dependent and rapid manner (steady-state in about two days). When exposed to nitrite in 2 g/L artificial sea salts for four days and then moved to a similar environment without added nitrite, complete depuration occurred within a day. Increasing salinity up to 10 g/L decreased uptake of environmental nitrite. Nitrite uptake in environments containing 2.0-2.3 g/L total dissolved solids composed of mixtures of salts other than artificial sea salts was similar to or lower than rates in 2 g/L artificial sea salt. Toxicity was inversely related to total dissolved solids and chloride concentrations and was highest in 2 g/L artificial sea salt (96-h medial lethal concentration = 8.4 mg/L nitrite-N).
Key words: nitrite, shrimp , Litopenaeus