Effects of chlorination on two larval stages of the oyster Crassostrea virginica (Gmelin, 1790), were studied in flowing estuarine water. Straight-hinge veliger larvae were exposed to concentrations of 0.01, 0.05, 0.1 and 0.2 ppm chlorineproduced oxidants (CPO) for 6, 12,24 and 36 h, and to 0.05, 0.1,0.2 and 0.3 ppm CPO for 8, 24, 48,72 and 96 h. Setting pediveliger larvae were exposed to 0.05, 0.1,0.2 and 0.3 ppm CPO for 6, 24, 48, 72 and 96 h in two experimental trials. Mortality of straighthinge and pediveliger larvae was directly related to increased concentrations of CPO and extended exposure tlme. Pediveliger larvae were generally more resistant to CPO than straight-hinge larvae, especially with longer exposure time. Equations for predicting mortality under different conditions of time and CPO concentration were developed using these data.
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