International Council for the Exploration of the Sea
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Workshop on the production of abundance estimates for sensitive species (WKABSENS)

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posted on 2021-09-24, 00:00 authored by ICESICES

The Workshop on the production of annual estimates of abundance of sensitive species (WKABSENS) met to define sensitive species, collate ICES assessments of abundance where these are available, and estimate indices of their abundance per swept-area where not, for the OSPAR area. The analyses identified 140 potentially sensitive species or species complexes, among which 10 are diadromous and three are coastal, 20 have uncertain species ID and nine were identified as sensitive in only one of the sources examined. Among the sensitive species and species complexes, there was sufficient data to provide abundance indices for 50 species, of which 16 had existing stock assessments whereas the workshop derived abundance estimates for the remaining 34 species from survey data. Three statistical modelling approaches (binomial, General Additive Models (GAMs) and VAST) and were explored and the final abundance indices were calculated using GAMs. The species were divided into stocks before estimating abundance indices where these could be identified from the spatial distribution of the species in the survey. The group considered that a similar analysis using data from additional surveys, commercial indices or data from bycatch observers can potentially provide improved abundance estimates for species with variable or low catchability, such as deep-water and pelagic species.


Published under the auspices of the following ICES Steering Group or Committee

  • EOSG

Published under the auspices of the following ICES Expert Group or Strategic Initiative



ICES Scientific Reports





Contributors (Editors)

Anna Rindorf

Contributors (Authors)

Juan Carlos Arronte; Francisco Baldó; Patrik Börjesson; Julia Calderwood; Stefania Charisiadou Miguel Cojan Burgos; Dafne Eerkes-Medrano; Patrícia Gonçalves; Ailbhe Kavanagh; Jed Kempf Eugenia Lefkaditou; Christopher Lynam; Inês Machado; Tobias Mildenberger; Teresa Moura Wolfgang Nikolaus Probst; David Reid; Anna Rindorf; Lara Salvany; Klaas Sys; Tiago Veiga-Malta Maria Ching Villanueva; Kai Wieland; Hongru Zhai



Recommended citation

ICES. 2021. Workshop on the production of abundance estimates for sensitive species (WKABSENS). ICES Scientific Reports. 3:96. 128 pp.