Temperature and toxicity of DDT to sea mullet (Mugil cephalus L.)

Sea mullet (Mugil cephalus) were exposed to aqueous suspensions of tech-DDT in seawater, salinity $\text{29.5±0.5‰}$. The 48 h LC₅₀ calculated from these static bioassays ranged from 0.042 to 0.056 mg l.^?1 DDT. Median survival times were then estimated at 15, 20, 25 and 30°C using the upper level of the 48 h LC₅₀ range of concentrations, i.e. 0.056 mg l.^?1. Results indicated that an increase in temperature produced a decrease in toxicity. However, 25°C was the only temperature at which the increase in survival time was statistically significant. Size differences within experimental fish did not contribute to MST.