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dc.contributor.authorClarke, M.
dc.contributor.authorEgan, A.
dc.contributor.authorMariani, S.
dc.contributor.authorMiller, D.
dc.identifier.citationClarke, M., Egan, A., Mariani, S. & Miller, D. (2011). Long term trends in population dynamics of NW Ireland herring revealed by data archaeology. ICES CM Documents, 2011/D:04. Accessed at
dc.descriptionThis article was originally published by ICES on their website
dc.description.abstractHerring populations to the northwest of Ireland are considered to constitute a single stock. They consist of a diverse array of autumn, winter and spring spawning components. They have been subject to large catches in the past. Landings peaked at 50 000 t in 1987 and have shown a slow decline since, as 2 dominant year classes, born in the 1980s, declined. No strong year classes have appeared since, and the stock is now outside safe biological limits. The time series of data available for stock assessment only covered the period 1970- present, even though routine sampling began after the end of World War I. In order to examine the stock trajectories over time, all catch at age data for the period 1921-1970 were compiled and analysed. The study revealed large fluctuations in the size of the stock and its productivity over time. Occasional strong cohorts occurred either singly, or in close together within 5 years of each other, and were observed at roughly 20-40 year intervals. Interspersed with this were long intervals of poor recruitment. Further historical analyses of 18th and 19th century records confirm this general periodicity. Overall results were examined in the context of time series of sea surface temperature data. The study can provide a basis for development of a long term management plan for the stock, using management strategy evaluation (MSE). The implications of this work, for the rational management of this stock for the future, are discussed.en_GB
dc.publisherInternational Council for the Exploration of the Sea (ICES)en_GB
dc.relation.ispartofseriesICES Conference and Meeting (CM) Documents;2011/D:04
dc.subjectNorthwest Irelanden_GB
dc.subjectHistorical analysesen_GB
dc.titleLong term trends in population dynamics of NW Ireland herring revealed by data archaeologyen_GB

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    This collection contains ICES Conference and Meeting (CM) Documents authored/co-authored by Marine Institute staff.

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