International Council for the Exploration of the Sea
NEAFC - effects on assessment of historical unaccounted landings of mackerel.pdf (184.89 kB)

NEAFC request on effects on assessments of historical unaccounted landings for mackerel and the utility of new and existing surveys

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posted on 2022-10-07, 08:56 authored by ICESICES

WGWIDE carried out a thorough analysis of the potential levels of underreporting over time and the sensitivity of the assessment to this uncertainty (Annex 3 in ICES, 2013c). The assessment showed sensitivity to such uncertainty, resulting in higher biomass with higher historical catch estimates. ICES decided to reject the assessment as a basis for advice. As a consequence, the advice is now based on the on recent landings, but this advice is seen as a temporary interim measure. ICES will attempt to incorporate more stock size information in an appropriate assessment model at the benchmark in 2014. Should this approach be unsuccessful a DLS approach will be developed based specifically on the triennial regime of survey data


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