Reference points for the Iberian sardine stock (ICES areas VIIIc and IXa)
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AuthorsSilva, A. (Alexandra); Uriarte, A. (Andrés); Riveiro, I. (Isabel); Santos, M.B. (María Begoña); Azevedo, M. (Manuela); Murta, A. (Alberto); Carrera-López, P. (Pablo); Ibaibarriaga, L. (Leire); Skagen, D. (Dankert)
Three Yield-Per-Recruit/stock-recruitment approaches (deterministic, stochastic with plotMSY and stochastic with HCS) were used to explore reference points for the management of the Iberian sardine. The sensitivity of reference points was evaluated in relation to alternative scenarios of productivity, growth and selectivity. Growth and selectivity scenarios had a small impact on stock projections whereas productivity scenarios were very influential. The three approaches gave coherent results, but the approach using HCS, assuming uncertainty in stock biology and recruitment dynamics, was preferred to derive reference points for sardine. In this approach, the risks of the stock fa lling below some low biomass level can also be taken into account. This possibility was considered to be useful in the case of the sardine for which exploitation at maximum YPR or F0.1 resulted in values above historical exploitation and higher than Floss, therefore unsuitable as precautionary management ...