Workshop on the assessment and management plan evaluation for Icelandic herring (WKICEHER) ...

• Main Author: ICES
• Format: Report
• Language: English
• Published: ICES Scientific Reports 2024
• Subjects: Fisheries and aquaculture; Icelandic Waters ICES Ecoregion; Hafnarfjörður; Iceland
• Online Access: https://dx.doi.org/10.17895/ices.pub.25605135.v1; https://ices-library.figshare.com/articles/report/Workshop_on_the_assessment_and_management_plan_evaluation_for_Icelandic_herring_WKICEHER_/25605135/1

WKICEHER 2024 met at the Marine and Freshwater Research Institute in Hafnarfjörður Iceland to benchmark the assessment methods and evaluate harvest control rules for Icelandic summer spawning herring (ISSH). The NFT-ADAPT assessment model was replaced by SAM. Notable changes to the input data are:The age range of catch indices used in the assessment are extended and a plus group is not included as before.Stock recruitment relationship is a “piecewise constant” which reduces the uncertainty of incoming recruitment.The model uses additionally a juvenile index that does not affect the assessment currently as the index is not up to date but will provide valuable recruitment information if reinstated. Ichthyophonus infection mortality was revaluated at the benchmark for the period 2008-2023 resulting in applying lower Ichthyophonus infection mortality than before in the assessment.The effect of these changes resulted in a downward revision of the reference biomass (age 4+) and in the spawning stock biomass ...