Abstract
Policy makers and fishery managers require accurate overviews of the performance of their harvesting sectors; trends in effective, as opposed to nominal, effort; and productivity creep due to unmeasurable factors. Traditional measures of nominal effort can lead to biased performance measures since fishing effort Is a multidimensional concept not readily captured by nominal measures. This paper evaluates the sources of growth In catch over time according to Its constituent components — the growth accounting framework — to measure trends In catch, nominal and effective effort, and productivity or fishing power. An empirical study of the US Pacific coast groundfish trawl fishery Indicates that traditional measures of effort and fishing power can be biased and highlights the relative Importance of growth In productivity or fishing power as an often overlooked and perhaps the most Important source of growth.
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