Temperature and toxicity of DDT to sea mullet (Mugil cephalus L.) |
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Authors: | J.H. Powell D.R. Fielder |
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Affiliation: | Department of Zoology, The University of Queensland, St. Lucia 4067, Australia |
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Abstract: | Sea mullet (Mugil cephalus) were exposed to aqueous suspensions of tech-DDT in seawater, salinity . 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. |
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