Bolles and Begg Distinction between silver hake stocks in US waters 



455 



50 



40 



30- 



20 



10 



50^ 

 40- 

 30- 



20^ 



i 

 10^ 



50- 



40- 



30 



20 



10 



1992 



Females 



Northern (n=289,r^=0. 78) -» 

 Southern (n=105,r^=0, 85) ^ 



50 



Males 



Northern (n=229.r^=0, 78) -» 

 Southern (n=107,r^=0 81) ^ 



1994 



Northern (fi=295,r =0.74) -» 

 Southern (n=184,r^=0.63) <s>- 



50- 

 40- 

 30- 

 20- 

 10 



Northern (n= 199, r =0,74) » 

 Southern (n=146,r^=0,58) o- 



1996 



Northern (n=189,f =0 69) -m- 

 Southern (n=170.r^=0,82) ^ 



50- 

 40- 

 30- 

 20- 

 10 



Northern (n= 138, r =0 62) -m- 

 Southern (n=105,r'=0,81) -&■ 



12 3 12 3 



Age group (years) 



Figure 3 



Linear growth relationships of silver hake samples (age groups 1 to 3) from the NEFSC 1992 

 (northern, F: S=6.41, 7=8.15; M: S=4.97, 7=9.98; southern, F; S'=6.83, 7=8.33, M: S=5.73, 7=9.58), 

 1994 (northern, F: S=6.75, 7=7.20; M: S=6.07, 7=8.33; southern, F: S=7.10, 7=6.99, M: S=4.84, 

 7=12.25), and 1996 (northern, F: S=6.91, 7=5.57; M: S=5.76, 7=8.30; southern, F: S=8.03, 7=3.72, 

 M: S=7.15, 7=4.65) spring surveys. (F=females; M=males; S=slope; 7=intercept; ?7=sample size; 

 r-=coefficient of determination ). 



lith morphometric variables not included in the compari- 

 sons of 3-year-olds (those variables based on the ANCOVA 

 results — area and length) were the most significant of the 

 variables examined individually for the other age groups, 



emphasizing the potential importance of these two vari- 

 ables for stock discrimination. 



Discriminant analyses provided further support for the 

 separation between northern and southern stocks among 



