Confiderice intervals for the mean anflual catch,
effort, and CPUE (and median CPUE) were calculated by randomization (bootstrap accelerated bias-corrected percentile (BCa) method) with 5000 replications because of the
small sample sizes and highly skewed distribution of daily catch and CPUE values
( Efron & Tibshirani 1993 ,Edgington 1995).