Preliminary assessments of megrim (Lepidorhombus whiffiagonis) and Four-spot megrim (L. boscii) in 8c9a using a4a model
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AuthorsAbad, E. (Esther)
URL Recurso relacionadohttps://doi.org/10.17895/ices.pub.8004
Both southern megrims stocks (L. whiffiagonis and L. boscii) are assessed in ICES Working Group for the Bay of Biscay and the Iberian Waters Ecoregion (WGBIE). The model used in the assessment is Extended Survivors Analysis (XSA) (Shepherd, 1992), software VPA95 Lowestoft suite. The XSA is a deterministic model. In recent years, the working group considers that it would be much more appropriate to use a model that incorporates uncertainty, especially since discards were included in the assessment. During WGBIE 2020, a preliminary assessment with a4a statistical catch at age model was pre-sented for megrim in 78abd. Based on that working document, this model was also chosen in a working group agreement to be tested in southern stocks.