Biological and species interaction survey of Pacific hake, sablefish, spiny dogfish and Pacific herring off the southwest coast of Vancouver Island, August 1987 / by W. Shaw, R. Tanasichuk, D.M. Ware,...: Fs97-4/2027E-PDF

"The La Pérouse Project is a multi-species, multidisciplinary study designed to evaluate the influence oi variations in physical and biological oceanographic factors on fish populations utilizing the lower west coast of Vancouver Island. From a fisheries oceanography perspective, the influence of oceanographic variations on groundfish species, in particular Pacific hake (Merluccius productus), and Pacific herring (Clupea harenqus pallasi), recruitment is of particular interest. Every August since the Project's inception in 1985, a fisheries survey has been conducted to determine the distribution, abundance and trophic interactions of the dominant fish species in the La Pérouse Bank area. These surveys have provided information on the impact of hake and other predators, such as sablefish (Anoplopoma fimbria) and spiny dogfish (Squalus acanthias), on Pacific herring. In addition, physical (temperature, salinity, density at depth) and biological (zooplankton sampling) oceanographic data were collected. The main objectives of the 1987 survey were (1) to sample major concentrations of hake, dogfish, sablefish and herring off the southwest coast of Vancouver Island, map their distribution, and determine their diets; (2) to delineate the northern limit of hake distribution off Vancouver Island, and (3) to collect physical oceanographic data from the survey area. This report presents the biological and oceanographic data collected during the survey"--Introduction, page [1].

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