Catch per unit effort (CPUE) is a common metric used in fisheries science to measure the efficiency of fishing activity, defined as the amount of catch (fish or other aquatic organisms) obtained per unit of effort expended (such as hours fished or number of hooks used). This term is crucial in understanding how recruitment and mortality rates influence fish populations, as it helps assess the health and sustainability of a fishery by indicating whether fishing efforts are leading to successful catches or depleting resources.
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