Reconstruction of Pacific ocean perch (Sebastes alutus) stock history in Queen Charlotte Sound. Part II, Catch per unit of effort as a measure of abundance, 1959-79 / by K.S. Ketchen.: Fs97-4/1599E-PDF

"Statistics of the Canadian fishery for Pacific ocean perch (Sebastes alutus) in Queen Charlotte Sound have been used to develop a new CPUE measure of relative abundance. This index is positively correlated with an earlier one based on the performance of a U.S. fishing fleet and is compatible with independent, provisional estimates of available biomass. A rapid decline in abundance occurred between 1965 and the early 1970s, a period of relatively heavy removals. By the late 1970s catch as well as total effort had reached its lowest point since the inception of fishing in the early 1950s. It is too soon to conclude that a modest reversal of the CPUE trend is a reflection of stock recovery. The new index of abundance has been applied to a range of estimates of total removals (required because of uncertainty about the reliability of reported foreign catch) to obtain a range of estimates of total fishing effort. These data are to be used in further stock assessment studies and reported in this publication series"--Abstract, page iii.

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