ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 22, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(8):1667-1672; doi:10.1093/icesjms/fsp143
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This article appears in the following ICES Journal of Marine Science issue: Herring: linking biology, ecology, and status of populations in the context of changing environments [View the issue table of contents]
When is year-class strength determined in western Baltic herring?
1 Johann Heinrich von Thünen-Institut, Federal Research Institute for Rural Areas, Forestry and Fisheries, Institute of Baltic Sea Fisheries, Alter Hafen Süd 2, 18069 Rostock, Germany
2 Wageningen Institute for Marine Resources and Ecosystem Studies, PO Box 68, 1970 AB IJmuiden, The Netherlands
3 Institute of Marine Research, PO Box 1870, Nordnes, 5817 Bergen, Norway
Correspondence to R. Oeberst: tel: +49 381 8116 125; fax: +49 381 9116 199; e-mail: rainer.oeberst{at}vti.bund.de
Oeberst, R., Klenz, B., Gröhsler, T., Dickey-Collas, M., Nash, R. D. M., and Zimmermann, C. 2009. When is year-class strength determined in western Baltic herring? – ICES Journal of Marine Science, 66: 1667–1672.Weekly surveys of larvae in the Strelasund and the Greifswalder Bodden were used to investigate when year-class strength is determined in western Baltic spring-spawning (WBSS) herring. An abundance metric of larvae reaching a length of 20 mm over the entire spawning season was constructed by accounting for increases in daily growth resulting from seasonal increases in temperature (5–20°C). The index was significantly correlated with the acoustic estimates of age-1 herring in the western Baltic Sea (r = 0.88) and with the estimates of year-class strength obtained from stock assessment (r = 0.65). Previous studies of herring elsewhere have reported that year-class strength is determined during the late larval stage, but we show that year-class strength can already be fixed at a larval length of only 20 mm. Although the index obtained may be used in stock assessment and predictions, the intriguing question remains, namely how can the signal of larval productivity from one single spawning component of WBSS herring reflect the year-class dynamics of the entire stock?
Keywords: Baltic Sea, herring larvae, year-class strength
Received 24 August 2008; accepted 16 March 2009; advance access publication 22 May 2009.
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