Saillant and Gold: Population structure and variance effective size of Lut/anus compechanus in tfie nortfiern Gulf of Mexico 



143 



and genotypes for smaller size and younger age at ma- 

 turity clearly exist (Gjerde, 1984; Tipping, 1991; Trip- 

 pel, 1995). These considerations indicate that a genetic 

 component to growth rate and age at maturity may 

 exist in red snapper, and if so, stock-structure consid- 

 erations solely on the basis of homogeneity in selectively 

 neutral genetic markers may not be warranted. 



Acknowledgments 



We thank A. Fisher for providing individual age data, 

 D. Nieland for providing life-history data, T. Turner 

 for extensive assistance with statistical analysis, the 

 Texas A&M supercomputing facility staff for help with 

 parallel processing of MLNE, and S.C. Bradfield, C. 

 Burridge, and L. Richardson for technical assistance. We 

 also thank W. Patterson and T. Turner for helpful com- 

 ments on early drafts of the manuscript, and J. Cowan 

 and C. Porch for providing estimates of red snapper 

 census size. Work was supported by the Gulf and South 

 Atlantic Fisheries Development Foundation (Grant 70- 

 04-20000/11824), by the Marfin Program of the U.S. 

 Department of Commerce (Grant NA87-FF-0426I, and 

 by the Texas Agricultural Experiment Station (Project 

 H-6703). This article is number 46 in the series "Genet- 

 ics Studies in Marine Fishes." 



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