Abstract
One of the main tasks of fisheries science and practice consists in maintaining commercial fish stocks on the level that ensures their sustainable utilization. Fishing intensity and selectivity are the basis of rational fishery and affect, on the one hand, commercial stock reproduction and, on the other hand, efficiency of stock utilization especially through combining selectivity regulation and fishery intensity. Commercial fish stocks may be maintained on the level close to the optimal one in different ways. Fishery intensity control based on total allowable catch (TAC) has been widely distributed. According to this term an annual assignment of catch quotas is performed for every fish species and fish group in a certain fishing area in order to avoid the risk of overfishing or underfishing.
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