Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 58, Issue 1, Pages 1-10Publisher
OXFORD UNIV PRESS
DOI: 10.1006/jmsc.1999.0490
Keywords
natural mortality; cod; catch curve; research survey
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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 ro directly estimate the instantaneous rare 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.
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