Table 1 . --Variation with size (standard length) in the number of dorsal spines and 

 soft rays, and anal soft rays: young striped bass taken (217 specimens 

 taken on July 23 and 24) in the James River, Virginia. 



No. of spines 

 in first dorsal 



No. of 

 specimens 



Standard length (mm .) 



Range 



Mean 



S.D. 



S.E. 



9 or fewer 150 35-89 51.67 9.67 0.79 



10 or more 69 39-71 50.94 6.87 0.83 



t = 0.56; not significant at the 5 percent level 



No . of dorsal 

 soft rays 



11 or fewer 96 38-82 51.50 8.77 0.90 



12 or more 123 35-89 51.44 9.06 0.82 



t = 05; not significant at the 5 percent level 



No . of anal 

 soft rays 



10 or fewer 58 38-80 50.02 7.12 0.93 



11 or more 161 35-89 51.99 9.39 0-74 



t = 1 .45; not significant at the 5 percent level 



Table 2. --Frequency of number of spines and soft rays in the dorsal and anal fins of 



young striped bass (taken on July 21 and 22, 1955) in the James River, Virginia. 



Locality 



No. of 

 specimens 



First dorsal spines 

 9 10 11 



Mean 



Windmill Pt . , J55 - f 59 



Bachelors Pt., J47 5 100 



Sloop Pt., J43 34 



Chickahominy R. mouth, C43 27 



Swan Pt . , J35 58 



HogIs.J29 . 39 

 X 2 =2.12, N. S. 



S(x-x)^ 



No . of specimens 



Second dorsal soft rays 

 10 11 12 13 



Mean 



S(x-x) 2 



Table 2 continued on next page 



97 



