Potts and Manooch Estimated ages of Pagrus pagrus 



89 



.Johnson (2000) used fishery-dependent samples, the larg- 

 est fish in that study was 489 mm TL, and their samples 

 came from primarily one location. Selectivity of fishing 

 gear may also explain differences in growth parameters. 

 For example, hook-and-line gear may catch faster growing 

 and more aggi'essive fish, whereas traps and trawls may 

 catch slower growing fish and overall smaller fish. We rec- 

 ommend that in future age and growth studies of any fish 

 species, samples represent the full range of fish sizes in a 

 population, including fish caught by many different gear 

 types, and are obtained from the entire geographic range 

 of the stock. Where practical, landings should be stratified 

 and sampled accordingly. 



Acknowledgments 



We would like to thank the port agents of the National 

 Marine Fisheries Service and the South Carolina Depart- 

 ment of Natural Resources MARMAP personnel for pro- 

 viding us with otolith samples. Jim Waters and Doug 

 Vaughan, NOAA's Center for Coastal Fisheries and Habi- 

 tat Research, were instrumental in the statistical analysis 

 of the length-at-age data and provided thoughtful com- 

 ments on the manuscript. Dean Ahrenholz and Joe Smith 

 also of NOAA's Center for Coastal Fisheries and Habitat 

 Research provided a critical review of the manuscript. 



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