Abstract
Trawling effort was standardized by horsepower class for Canadian trawlers landing Pacific Cod (Gadus macrocephalus) and its two principal shelf cohabitants during April–September 1960–81 from the three major offshore regions: southwest Vancouver Island, Queen Charlotte Sound, and Hecate Strait. A linear relationship was demonstrated between landings-per-hour-trawled (LPUE) and vessel horsepower class, with respect to appropriate shelf species groups in each region. Efforts to calculate relative fishing power (RFP) with respect to individual species were frustrated, for one species, by differential depth distribution of effort and abundance. With respect to Pacific cod in northern Hecate Strait, nominal LPUE was shown to underestimate abundance during the 1960s and overestimate abundance in the late 1970s.
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