Use of fisheries statistics for the Tanner crab stock dynamics
2019
Buyanovsky, A.I.
Several methods of the of the stock increment estimation based on the tanner crab daily catches dynamics are analyzed for three populations. The estimated annual increment occurs minimal if both (1) the fisheries period is divided into several seasons, (2) the vessel factor is taken into account, (3) average daily catches are calculated for each season. The deviation on the square change is recommended to be applied for the estimation of the stock change only if the square decreases. If it increases the deviation should be applied if it is proved that the new fishery aggregations appeared. Algorithm of the calculation of available stock dynamics is given. Calculation of the corrected stock assessment based on the indicator approach (trafficlight method) and taken in account the data of both sample surveys and fisheries statistics is proposed
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