FISHERY BULLETIN: VOL 86, NO. 1 



solved. There remains a great need both for new 

 methods, and refinements of the old. 



ACKNOWLEDGMENTS 



This review was initiated in response to a re- 

 quest for Deus ex machina in mortality estima- 

 tion for fish stocks, elicited from participants at 

 the 35th Annual Tuna Conference held at Lake 

 Arrowhead, CA, 20-22 May 1984, during a discus- 

 sion organized in an attempt to identify the single 

 most important but least well-estimated parame- 

 ter in fishery models. The author apologizes for 

 the lack of divine inspiration herein, but extends 

 grateful thanks to Chris Boggs, Andy Dizon, John 

 Hoenig, Pierre Kleiber, Robert Olsen, and two 

 anonymous reviewers for their insightful discus- 

 sion and helpful comments during preparation of 

 this review. 



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40 



