The 'four factors'-recruitment, growth, natural and fishing mortalities–viewed in classical fish dynamics as needed for predicting future from present stock sizes, are reviewed in the context of lagoon fisheries, whose worldwide catches and management are briefly discussed. Emphasis is given herein to the bordigue, a form of tidal trap used in the western Mediterranean area to harvest fish previously recruited to a lagoon, and/or retain undersized fish for another growth cycle. This form of harvest/management, which requires complex social arrangements, may, short of aquaculture, represent the optimum way of utilizing a lagoon to producefish.
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