respectively) were consistent with pyrethroid concentrations measured after treatment of salmon. Detected water concentrations around salmon cages were quantified
using an ethylene–vinyl acetate (EVA) copolymer passive sampler. Water concentrations ranged from 0.3 to 13.6 for cypermethrin and 0.1 to 4.3 for deltamethrin (see
Sect. 2.2.1).
In contrast, estimated sediment concentrations were slightly overestimated relative to measured concentrations under salmon cages; however, they were close to the
higher sediment levels detected in Southern Chile: 1,323 ng g
À1 and 1,020 ng g
À1
for cypermethrin and deltamethrin, respectively (see Sect. 2.2.2).
For all predicted water and sediment concentrations, the model always presented
a greater concentration than the measured concentration. This could suggest that the
model predicts the worst-case scenario, essential for assessing the environmental
risks of chemicals used in the salmon industry.
Predicted
Measured
Water cypermethrin
Sediment cypermethrin
Water deltamethrin
Sediment deltamethrin
Fig. 2 Measured and modeled concentrations of cypermethrin and deltamethrin used to treat
salmon
Environmental Risks of Synthetic Pyrethroids Used by the Salmon Industry in. . .
187