Acute toxicity to and bioconcentration of endosulfan by estuarine animals

摘要: Acute (96-h) flow-through toxicity tests with endosulfan (Thiodan) were conducted several estuarine animals. The test species and their 96-h lethal concentration for 50 percent of the organisms (LC 5 0 ) values were: pink shrimp (Penaeus duorarum), 0.04 μg/litre; grass (Palaemonetes pugio), 1.3 pinfish (Lagodon rhomboides), 0.3 spot (Leiostomus xanthurus), 0.09 striped mullet (Mugil cephalus), 0.38 μg/litre. In a 56-day bioconcentration study (28-day uptake, 28-day depuration), exposed to 0.008 0.08 μg endosulfan/litre seawater. two isomers (endosulfan I II) rapidly metabolized sulfate; only trace amounts each isomer detected in edible tissue or offal μg/litre (0.035 measured) 28 days. Maximum factors 2249 2755 whole-body analyses. After 48 h pesticide-free seawater, was not previously mullet. Our studies suggest that environment would be hazard because its acute potential, but animals surviving exposure moving areas free lose chemical rapidly.