Benchmark workshop on anglerfish and hake (WKANGHAKE; outputs from 2022 meeting)

The benchmark workshop on anglerfish (Lophius budegassa, Lophius piscatorius) and hake (Mer-luccius merluccius) (WKANGHAKE) was the first ICES benchmark entirely dedicated to assess-ment models run with the integrated model Stock Synthesis (SS) software. Besides the data work-shop, which was held in November 2021, several online sessions were held on a continuous basis with all participants, including the reviewers and chairs between November 2021 and February 2022. Those sessions were focused on model development through constant online feedback be-tween stock assessor teams, reviewers, and chairs. The continuous feedback resulted in several key issues being resolved before the actual benchmark meeting took place in February 2022 and was of great benefit to both the assessment teams and the reviewers. Four stocks, pertaining to the ICES assessment working group WGBIE (Working Group for the Bay of Biscay and the Ibe-rian Waters Ecoregion) were assessed during the benchmark. These were: Hake (Merluccius mer-luccius) in divisions 8.c and 9.a, Southern stock (Cantabrian Sea and Atlantic Iberian waters; hke.27.8c9a); Hake (Merluccius merluccius) in subareas 4, 6, and 7, and divisions 3.a, 8.a–b, and 8.d, Northern stock (Greater North Sea, Celtic Seas, and the northern Bay of Biscay; hke.27.3a46-8abd); White anglerfish (Lophius piscatorius) in Subarea 7 and divisions 8.a–b and 8.d (Celtic Seas, Bay of Biscay; mon.27.78abd); and Black-bellied anglerfish (Lophius budegassa) in Subarea 7 and divisions 8.a–b and 8.d (Celtic Seas, Bay of Biscay; ank.27.78abd). For all stocks a final model was developed and agreed to be appropriate to determine stock status and provide short-term catch forecast. The extensive exploration of input data and model configurations carried out during the benchmark also resulted in several recommendations regarding on how to improve the esti-mation of biological parameters to be used in the models, and the possibility of developing area-based models in future benchmarks which would likely allow conflict resolutions in survey in-dices observed in most of the models.

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ICES (2023). Benchmark workshop on anglerfish and hake (WKANGHAKE; outputs from 2022 meeting). ICES Scientific Reports/Rapports scientifiques du CIEM. 5 (17). 354 p..,

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