Natural mortality of cod (Gadus morhua) in the southern Gulf of St Lawrence

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.