58 



Fishery Bulletin 97(1), 1999 



identical to those predicted based on sequence data 

 (Table 4). The list of species that showed no varia- 

 tion in restriction pattern included silky and dusky 

 sharks from widely disparate geographic locales. 



Discussion 



Restriction digests of the diagnostic 394-396 bp frag- 

 ment proved a reliable way to distinguish among the 



Table 4 



Number and location of sharks whose mtDNA was subjected to restriction enzyme digestion. Numbers in parentheses represent 

 number of sharks from each source location in the sample. 



Species 



Great hammerhead 7 



Scalloped hammerhead 7 



Source of specimen 



Virginia. Atlantic Ocean (4) 



Virginia, Atlantic Ocean ( 1 >; Florida, Gulf of Mexico (6) 



Florida, Gulf of Mexico (7) 



Virginia, Atlantic Ocean (2); Florida, Atlantic Ocean (1 1; Australia, Pacific Ocean (3); 

 Australia, Indian Ocean ( 1 ) 



Florida, Gulf of Mexico 1 6); Mexico, Gulf of Mexico ( 11 



Florida, Gulf of Mexico (7); Hawaii, Pacific Ocean (3) 



Texas, Gulf of Mexico (3); Hawaii, Pacific Ocean (4) 



Virginia, Atlantic Ocean (1); Florida, Atlantic Ocean (3); Florida, Gulf of Mexico (1); 



Australia, Pacific Ocean (2) 



Florida. Gulf of Mexico (5); Australia, Pacific Ocean (2 1 

 Hawaii. Pacific Ocean (3) 



Florida, Gulf of Mexico, Florida (6); Florida, Atlantic Ocean (1) 



Virginia, Atlantic Ocean (1); Florida, Gulf of Mexico (2); Alabama, Gulf of Mexico (1); 

 Texas, Gulf of Mexico ( 1 ); Campeche, Gulf of Mexico 1 2 1 



