Acropora tenuis 3 d.o. larvae showed no apparent
mortality effects from dispersant concentrations up to
15 ppm, but at ≥ 75 ppm there was 100 % mortality
of these larvae after 12 hours of exposure. A. tenuis 11
d.o. larvae also suffered 100 % mortality at dispersant
concentrations ≥ 75 ppm after 12 hours. Dispersant LC50
values ranged from 32.8 ppm at 12 hours down to 25.4
ppm after 96 hours for A. tenuis 3 d.o. larvae. A. tenuis
11 d.o. had a similar LC50 value to 3 d.o. larvae, of 35.0
ppm after 12 hours, but a much lower 96-hour LC50 of
8.3 ppm (Fig. 1).