NYMAN and CONOVER: YOUNG-OF-THE-YEAR BLUEFISH 



Figure 7. — Relation between number of days 

 since marking with tetracycline and the number 

 of growth increments beyond the mark in YOY 

 bluefish maintained in a field cage. 



q: 



< 

 2 



O 



>- 

 UJ 

 CD 



(n 



I- 

 z 



UJ 



70 



60 



50 



40 - 



30 



S 20 



u 



z 



10 



Y= 0.97IX- 0.287 



r = 0.996 



1 



1 



1 



1 



1 



10 20 30 40 50 60 

 DAYS SINCE INITIAL MARKING 



70 



O 

 UJ 



o 



UJ 



on 

 u. 



Figure 8. — Back-calculated date of first ring deposi- 

 tion for YOY bluefish (no.) as determined by count- 

 ing daily growth rings, (a) and (b) represent fish 

 from Great South Bay in 1985 and 1986, respec- 

 tively, (c) is for fish seined from the Hudson River 

 on 23 September 1986. 



MAR APR MAY JUN JUL MAR APR MAY JUN JUL 



DATE OF FIRST RING DEPOSITION 



245 



