International Council for the Exploration of the Sea
1994_H7.pdf (1.6 MB)

Report of the Workshop on Herring Age Reading

Download (1.6 MB)
posted on 2022-12-05, 10:43 authored by ICESICES

Sixteen herring otolith readers from 10 different West-European countries met in IJmuiden to compare methods and to describe procedures for standardization and improved quality of herring age readings. Agreement between readers varied between 63% and 79%, depending on the racial composition of the sampies and the time of the year in which they were taken. A special problem was presented by the difference in timing of the formation of the new summer growth zone; in young herring (2-3 rings) this takes place earlier in the season than in older herring. The ageing of herring also depended on the ability to classify fish as an autumn or spring spawner. This classification is normally made on the basis of additional information on maturity stage.


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

  • Historical content

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

Workshop on Herring Age Reading


ICES Expert Group Reports

Contributors (Editors)

A. Corten

Recommended citation

ICES. 1994. Report of the Workshop on Herring Age Reading. 20-24 January 1994, IJmuiden, The Netherlands. ICES CM 1994 / H:7.

Usage metrics

    ICES Expert Group reports (until 2018)


    Ref. manager