ACKNOWLEDGM ENTS 



The successful outcome of the Tortugas experi- 

 ment must in large part be attributed to the 

 unstinting efforts of those responsible for its 

 implementation and completion. Acknowledg- 

 ment is especially due Thomas J. Costello who 

 guided the experiment's marking and recovery 

 phases; credit for assistance in all aspects of 

 the field work is extended to Bureau and industry 

 personnel alike. The author also appreciates the 

 assistance rendered by Charles H. Lyles, Jr. and 

 George W. Snow, Branch of Statistics, who 

 expedited the availability of certain commercial 

 fishery statistics employed in the analysis. Special 

 thanks go to Kenneth N. Baxter for his painstaking 

 computation of estimates of fishing effort. 



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U.S. FISH AND WILDLIFE SERVICE 



