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productivity
(english) A measure of the capacity of a biological system, the amount of fish supported or produced by a given area in a given time. Also used as a measure of the efficiency with which a biological system converts energy into growth and production. Relates to the birthm growth and mortality rates of a fish stock. Highly productive stocks are characterised by high birth, growth and mortality rates and can usually sustain hgher exploitation rates and, if depleted, could recover more rapidly than comparatively less productive stocks.

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