A simple t-test on log-transformed data was used to test the difference in size and length between fish caught in the trap and gillnet. Since the count data for the number of sea lice per fish did not conform to either a normal or a Poisson distribution (i.e.overdispersion), a Wilcox rank sum test was used to test for differences between the number of larval, adult and total number of sea lice on sea trout. To correct for multiple tests, a Bonferroni correction was applied to the significance level (˛corr = ˛/3). All statistics were calculated using R v2.14.0.