On the Use of the Terms Abundance, Availability and Apparent Abundance in Fishery Biology

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Abstract
Three important concepts in fishery biology are discussed and defined as follows: "Abundance" is the absolute number of individuals in a population. "Availability" is the degree (a percentage) to which a population is accessible to the efforts of a fishery. "Apparent abundance" is the abundance as affected by availability, or the absolute number of fish accessible to a fishery.

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