FISHERY BULLETIN: VOL. 74, NO. 1 



Mexico; its environmental qualities which are 

 much more similar to those in the gulf account for 

 the common occurrence in the bay of penaeid 

 shrimps of the genera Trachypenaeus and Si- 

 cyonia normally found in the offshore waters of 

 the open gulf; the unusual environmental factors 

 within the system also delay the migration of 

 penaeid shrimps of the genus Penaeus into the 

 open gulf, thereby allowing them to grow larger 

 within the St. Andrew Bay system. 



ACKNOWLEDGMENTS 



We thank Maxwell Miller and Leslie Touart for 

 their help in collecting and processing the sam- 

 ples and David Muenzel, Captain of the RV 

 Rachel Carson, for his assistance in keeping us on 

 schedule. We gratefully acknowledge the critical 

 reviews of this manuscript by David Aldrich 

 (Texas A&M University), Donald Allen (National 

 Marine Fisheries Service, NOAA), and William 

 Lyons (Florida Department of Natural Re- 

 sources). 



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