Scientific, Technical and Economic Committee for Fisheries (STECF) – Multiannual Plan for the fisheries exploiting demersal stocks in the Adriatic Sea (STECF-19-02).
Ulrich; C.; Abella; J. A.; Andersen; J.; Arrizabalaga; H.; Bailey; N.; Bertignac; M.; Borges; L.; Cardinale; M.; Catchpole; T.; Curtis; H.; Daskalov; G.; D"oring; R.; Gascuel; D.; Knittweis; L.; Lloret; J.; Malvarosa; L.; Martin; P.; Motova; A.; Murua; H.; Nord; J.; Prellezo; R.; Raid; T.; Sabatella; E.; Sala; A.; Scarcella; G.; Soldo; A.; Somarakis; S.; Stransky; C.; van Hoof; L.; Vanhee; W.; van Oostenbrugge; H.; Vrgoc; N.; Jardim; E.; Accadia; P.; Avdic Mravlje; E.; Bastardie; F.; Bolognini; L.; Daskalov; G.; Grati; F.; Isajlovic; I.; Konrad; C.; Mannini; A.; Mantopoulou-Palouka; D.; Mihanovic; M.; Mosqueira; I.; Pinto; C.; Raid; T.; Vasilakopoulos; P.;
STECF was requested to test the performance of HCRs for Adriatic sea stocks of hake, sole, deep water rose shrimp, red mullet, Nephrops and spottail mantis shrimp. The HCRs were based in (i) effort management and catch limits for sole and Nephrops, (ii) two options of intermediate period effort reductions and (iii) two options of spatial management, the sole sanctuary and 6nm closures. Additionally STECF was required to estimate areas of high persistence of adults ort juveniles for the same stocks.
The ToR were addressed to the best knowledge and data available. The short time interval between the ToR’s publication and the meeting limited the amount of work done. The quantitative analysis was carried out following the best modelling practices. In Annexes 1 to 4 the models used by the EWG are described.
A Management Strategies Evaluation (MSE) algorithm developed in FLR and a4a (Annex 2) was used to run the scenarios requested by the ToRs. A set of robustness scenarios were added when relevant. These scenarios were stock specific and dealt with potential uncertainties in dynamics’ assumptions.
Baselines for all stocks were built by running projections up to 2035 with a target F equal to F status quo, which was computed by the average F of the most recent 3 years in the assessment.
Fisheries and biological indicators were computed for all scenarios in three time periods, short term (2018-2024), long term (2025-2035) and equilibrium (2031-2035). Where relevant confidence intervals were also computed.
With relation to the economic indicators only GVA and salary were reported for the baseline scenarios. Additionally economic dependency on MAP stocks and contribution to total landings, by fleet, were also reported.
Operating models (OM) were conditioned based in the most recent stock assessments. The selection of stock assessments was discussed with GFCM’s secretariat to make sure the correct models were used. In most cases it was possible to keep the original model, with the exception of hake which required a a4a model to mimic the original stock assessment. The reference points used were obtained from the original stock assessment reports.