Karin Hüssy, Beatriz Morales-Nin, Carmen Piñeiro Álvarez, Hélène de Pontual, Joanne Smith, Kélig Mahe, Uwe Krumme, Sally Songer, Yvonne Walther, Javier Rey

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This chapter was written during the Workshop on Age Validation of Gadoids (WKAVGS 2013) which was held 6–10 May 2013 at Imedea in Esporles, Mallorca. The terms of reference for the workshop were to:

1. Review information on age estimations, otolith exchanges, workshops, and
validation works done so far on the following species: European hake, cod, pollock, saithe, haddock, whiting, and blue whiting;
2. Assemble and compare the results of different validation methods (i.e. marking and recapture, marking the calcified structure, marginal increment analysis, marginal analysis, modal progression analysis, length back-calculation, etc.);
3. Discuss and propose the most appropriate validation methods of age and growth pattern of calcified structures (CS), for each species and stock;
4. Propose the appropriate validation methods to recognize the growth check as well as the spawning ring, demersal ring, migration ring, etc.;
5. Propose an ICES Cooperative Research Report on: Age Validation Studies for ICES and GCFM Gadoid Stocks to ICES PGCCDBS, using previous studies and the outcome of this workshop;
6. Based on results, conclusions, and recommendations from this workshop to initiate and design an international cooperation project on validation methods (such as on the validation of checks and spawning rings) to commence after the workshop.
Original languageEnglish
Title of host publicationHandbook of fish age estimation protocols and validation methods
EditorsF. Vitale , L. Worsøe Clausen , G. Ní Chonchúir
PublisherInternational Council for the Exploration of the Sea (ICES)
Publication date2019
ISBN (Electronic)978-87-7482-223-3
Publication statusPublished - 2019
Event2013 Workshop on Age Validation of Gadoids - Mallorca, Spain
Duration: 6 May 201310 May 2013


Conference2013 Workshop on Age Validation of Gadoids
SeriesI C E S Cooperative Research Report

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