Theoretical study of the between-haul variation of haddock selectivity in a diamond mesh cod-end

We demonstrate how haul-to-haul variation of the population density, the population structure and the spatial distribution of both the target and by-catch species may lead to between-haul variation of cod-end selection. We also show that for reasonable levels of variation of these parameters PRESEMO can simulate selection estimates that are consistent with and have comparable levels of between-haul variation as those obtained experimentally.