Assessment of Patagonian Toothfish (Dissostichus eleginoides) in Subarea 48.4

This paper describes an update of the assessment of Patagonian toothfish (D. eleginoides) in Subarea 48.4. The assessment data are updated with the observations for the 2023 and 2024 seasons. In addition to the inclusion of two further years’ data, alternative approaches to data-weighting for age-length observations used in the model are considered. Projections indicate that the stock was at 65% of B₀ in 2025 and that a yield of 33 tonnes in 2026 and 2027 is consistent with the application of the CCAMLR Decision Rule. 

Based on this assessment, we propose two recommendations from Working Group FSA to the Scientific Committee:

1. that the Francis weighting be applied to the age-length observations in the Casal2 stock assessment,
2. that the catch limit for D. eleginoides in Subarea 48.4 should be set at 33 tonnes for 2025/26 and 2026/27.