International Council for the Exploration of the Sea
Workshop on Unavoidable Survey Effort Reduction 2 (WKUSER2).pdf (4.6 MB)

Workshop on Unavoidable Survey Effort Reduction 2 (WKUSER2)

Download (4.6 MB)
posted on 2024-01-25, 08:07 authored by ICESICES

The Workshop on Unavoidable Survey Effort Reduction 2 (WKUSER2) focused on best-available approaches that can minimize information loss and ensure continuity in survey time series when unavoidable changes to survey effort occur. WKUSER2 recognised that reductions, reallo-cations, or increases in survey effort present similar set of problems, and therefore concentrated on all aspects of survey effort changes. The workshop reviewed available research, current practices, and recommended future directions on four key topics: (i) key elements of flexibility of a survey, (ii) why and how to combine data from different sources (e.g. surveys, fishery sampling) and deal with survey gaps, (iii) how to configure estimation and simulation models, and (iv) review existing tools and technology to evaluate consequences of survey effort changes. Road maps were developed for the key topic areas i, ii, iii, and iv, whenener possible, to assist scientists and survey managers in making decisions on how to evaluate and mitigate the impact of survey effort changes on data and advice quality. Many tools are available or are being developed for that purpose, but the group recognized two important needs during the workshop: i) defining clear objectives and priorities of a survey, which are essential to properly evaluate con-sequences of survey changes; and ii) making all tools accessible, reproducible, and transparent to benefit the whole community. This requires organisational and cultural shift to create support systems that ensure the development and sustainability of such tools in the future.


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)

Hans Gerritsen, Stan Kotwicki, Kotaro Ono

Contributors (Authors)

Sean Anderson; Nate Bacheler; Lewis Barnett; Casper Berg; Kristan Blackhart; Derek Bolser; Patrik Börjesson; Meaghan Bryan; Thibault Cariou; Corina Chaves; Elizabeth Chilton; Jason Conner; Annica De Groote; Lukas DeFilippo; Paul Dolder; Catherine Foley; Hans Gerritsen; Madison Hall; Espen Johnsen; Eoghan Kelly; Stan Kotwicki; Sven Kupschus; Gwladys Lambert; Andy Lipsky; Emily Markowitz; Guillermo Martin; Angelia Miller; Coilin Minto; Bríd O'Connor; Kotaro Ono; Zack Oyafuso; Iosu Paradinas; Maria Grazia Pennino; Elizabeth Phillips; John Gabriel Ramirez; Yves Reecht; Paul Regular; Margaret Siple; Matt Siskey; David Stokes; Anna Stroh; James T Thorson; Ralf van Hal; Joel Vigneau; Daniel Vilas; Kai Wieland; Semra Yalcin



Recommended citation

ICES. 2023. Workshop on Unavoidable Survey Effort Reduction 2 (WKUSER2). ICES Scientific Reports. 5:13. 115 pp.

Publication language

  • en

File format(s)

  • PDF