KATZ ET AL.: DELINEATION OF TILEFISH STOCKS 



ESTERASE IDH 



Gulf of Mexico - 

 Campeche Banks 



N = 16 



N = 16 



Gulf of Mexico- 



Off TexaS 045 077 



Gulf of Mexico - 



off Wesf Florida 0541073 



South Atlantic Bight - ^^^ 



oft South Carolina 048-074 



Mid- Atlantic Bight - 

 Hudson Canyon 



Mid-Atlantic Bight - 

 Niche' 



Mid -Atlantic Bight - 

 Block Canyon 



Mid Atlantic Bight- 

 Atlantis Canyon 



Mid Atlantic Bight - 

 Veatch Canyon 



21 



23 



23 



89 



49 



84 



50 



85 



23 



76 



80 



44 



39 



02 04 06 08 10 02 04 06 08 10 



ALLELIC FREQUENCY 



Figure 3.— Allelic frequencies of esterase and isocitrate de- 

 hydrogenase (IDH) for tilefish samples collected along the U.S. 

 east coast and the Gulf of Mexico. Mean allelic frequency indi- 

 cated by vertical line and bands represents 95% confidence in- 

 tervals. Allelic frequency and standard error below bands. 

 "Niche" = fisherman name of area approximately 50 km east of 

 Hudson Canyon. 



and less consistently the upper and lower gill 

 raker number, differed significantly for the 

 males and females from South Carolina and Gulf 

 of Mexico samples (Tables 3, 4). These differences 

 were not size related because there was no sig- 

 nificant difference between fish size and gill 

 raker number (R 2 = 0.22, n = 328). 



Sexual dimorphism was apparent for several 

 morphometric characters (Table 5); therefore all 

 comparisons among morphometric characters 

 were made separately for each sex. 



Separate comparisons of male and female 

 morphometric characters indicated that there 

 were no significant differences among all of the 

 east coast samples (Mid-Atlantic Bight and South 

 Carolina— Tables 3, 4). The Gulf of Mexico sam- 

 ples, however, differed from the west Hudson 

 Canyon site for most comparisons. In 16 of the 20 

 comparisons for males and 18 of the 20 for fe- 

 males the samples were significantly different 

 (Tables 3, 4). 



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