A quota is the allowable number or amount of fish that can be harvested in a commercial or recreational fishery. This is a regulatory strategy to limit harvest. They are set each fishing season based on allowance for sustainable harvest (e.g., see Maximum Sustainable Yield).
Image credit: Fisheries New Zealand, mpi.govt.nz)
In certain commercial fisheries, quotas are essentially equivalent to a “share” in a fish stock. These Individual Transferable Quotas (ITQs) can be bought and sold and entitle the owner to a given proportion of the Total Allowable Catch (TAC) for a fishing season.(fishionary.fisheries.org/quota).
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