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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):1-10; doi:10.1006/jmsc.1999.0490
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Natural mortality of cod (Gadus morhua) in the Southern Gulf of St Lawrence

A. F. Sinclair

Department of Fisheries and Oceans, Gulf Fisheries Centre P.O. Box 5030, Moncton, NB, Canada, E1C 9B6 sinclairai{at}dfo-mgo.gc.ca

The closure of the cod fishery in Canada's southern Gulf of St Lawrence, and the existence of a reliable research vessel (RV) survey of the stock, has provided a unique opportunity to directly estimate the instantaneous rate of natural mortality (M) of a commercial cod stock. The results indicate that M is currently in the range of 0.4, which is higher than the value of 0.2 assumed in the past. An M of 0.4 is not inconsistent with the observed age range of cod in commercial catches and with recent growth characteristics of the stock. There is evidence that M may have increased in the early 1980s.

Keywords: natural mortality, cod, catch curve, research survey

Received 26 October 1998; accepted 7 April 1999.


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