ADHOC - Evaluations of Management strategies for Norway pout in the North Sea and Skagerrak Report
The proposed Management Strategies (Options 1, 2 and 3) are in accordance with the sustainability criteria under the precautionary approach given a minimum TAC of maximum 27 kt and an assumption about future fishing mortality or fishing effort within the range of the values observed for the last decade.
Application of a higher minimum TAC (50 kt), is possible for option 2 and 3. This higher minimum TAC is mainly due to the scenario assumption that the minimum TAC for option 2 and 3 has to be taken within the first half-year while the minimum TAC can be taken within the full year for option 1. With the assumption of an upper limit on realised fishing mortality (Cap F) by half-year, the realised catch can be higher with option 1 which increases the risk of overfishing in years with a low stock size.
The risk for SSB below Blim for option 1 and 3 is not sensitive to the choice of maxi-mum TAC. However, both a high minimum TAC and a high maximum TAC make the risk to Blim more sensitive to the scenario assumption of a Cap F. A high mini-mum TAC in combination with a high maximum TAC might require effort manage-ment to ensure that fishing mortality remains within the range of the values observed for the last decade.
The management strategy evaluations and simulations confirm the general observa-tion that a fixed F strategy will provide a lower long term yield than an escapement strategy for such a short lived species like Norway pout. The “cost” of the escape-ment strategy is a much more variable fishing mortality from one year to the next. Stability in landings is also lower for the escapement strategy.
Published under the auspices of the following ICES Steering Group or Committee