| A multiplication model, fitted by weighted least squares, is used to determine factors affecting monthly c.p.u.e. of monk (anglerfish). These include annual indices of abundance, from which concentration indices may be calculated; seasonal factors at different depths; and relative fishing power. A steep increase in the total annual index of abundance may be partially explained by the simultaneous increase of the smallest fishes index. The increased concentration index of this commercial category is probably due to a decrease of discards; as suggested by severa! authors, however, climatic changes may also account for increased biomass of the species considered. |
