Table 9. — Analysis of variance on merlstic counts for differences 

 between locations and between years within rivers, and differences 

 between rivers, for samples of juvenile American shad from 

 Chesapeake Bay tributaries 







Degrees 





River 



Component 



freedom 



F-value 



York 



Between locations: 











1,197 



0.514 







1,197 



0.391 







1,197 



6.569 







1,197 



0.000 





Between years: 









(Panrunkey River only) 











3,196 



2.335 







3,196 



0.651 







3,196 



0.493 







3,196 





James 



Between locations: 









1, 98 



0.117 







1, 98 



1.938 







1, 98 



0.269 







1, 98 







Between years; 







(Claremont Beach only) 











1, 98 



4.914 





Dorsal fin rays 



1, 98 



1.635 







1, 98 



3.419 







1, 98 



0.570 



Rappahannock-Jame s 



Between rivers: 









1,248 



13. 258** 







1,248 



9. 922** 







1,248 



46.227** 







1,248 



0.011 



Rappahannock-York 



Between rivers: 







Pectoral fin ravs 



1,398 



188.925** 







1,398 



0.835 







1,398 



10.885** 







1,398 



37.095** 



Rappahannock- 



Between rivers: 





Susquehanna 





1,148 



46.512** 







1,148 



3.287 







1,148 



2.111 







1,148 



38.965** 



James -York 



Between rivers: 











1,448 



131. 156** 







1,448 



27.412** 







1,448 



22.951** 







1,448 



47.494** 



Jamps -Susquehanna 



Between rivers: 









1,198 



21.394** 





Dorsal fin rays 



1,198 



0.476 







1,198 



16.101** 







1,198 



41.121** 



York-Susquehanna 



Between rivers: 









1,348 



7.570** 







1,348 



7.859** 







1,348 



0.798 





Scutes 



1,348 



3.550 









South Atlantic Area 



Meristic counts were made of juvenile shad 

 taken for certain years at locations in the 

 Neuse, Edisto, Ogeechee, and St. Johns Rivers 

 of the South Atlantic area (tables 10, 11, 12, 

 and 13). 



Neuse River . --Based on the 1954 samples 

 (table 10), differences in the meristic counts 

 were not significant between the Bridgetonand 

 Streets Ferry samples. Differences in the 

 meristic counts were not significant between 

 years for the Bridgeton samples (table 14). 



Table 10. — Frequencies of meristic counts from juvenile American shad 

 in samples from the Neuse River, N. C. 



Statistically different at 1 percent level. 







Number of 







Location 



Year 



pectoral fin rays 



Mean 



Standard 





12 13 14 15 16 17 18 19 



deviation 







Frequency 







Bridgeton 



1950 



- 9 36 5 - 



15.92 



0. 5284 



Do. 



1954 



- 12 31 6 1 



15.92 



0.6652 



Do. 



1957 



1 7 28 14 - 



16.14 



0.7001 



Do. 



1958 



- 7 25 18 - 



16.22 



0.6788 



Streets Ferry 



1954 



1 14 29 6 - 



15.80 



0.6701 





Number of 









dorsal fin ravs 









15 16 17 18 19 20 21 22 







Frequency 





Bridgeton 



1950 



3 17 26 4 - 



18.56 



0. 7329 



Do. 



1954 



- 10 33 7 - 



18.92 



0. 5859 



Do. 



1957 



- 16 28 6 - 



18.80 



0.6389 



Do. 



1958 



- 21 25 3 1 



18.68 



0.6833 



Streets Ferry 



1954 



- 10 33 7 - 



18.74 



0.8033 





Number of 









anal fin rays 









18 19 20 21 22 23 24 25 







Frequency 





Bridgeton 



1950 



2 8 22 16 2 - 



21.56 



0.8889 



Do. 



1954 



- 4 15 20 10 1 



21.58 



0.9708 



Do. 



1957 



2 6 15 21 6 - 



21.46 



0.9941 



Do. 



1958 



2 5 20 18 5 - 



21.38 



0. 9452 



Streets Ferry 



1954 



- 6 14 21 9 - 



21.78 



0.9322 





Number of scutes 







33 34 35 36 37 38 39 40 







Frequency 





Bridgeton 



1950 



1 7 17 15 7 3 



36.58 



1.1445 



Do. 



1954 



2 8 20 16 4 - 



35.24 



0. 9596 



Do. 



1957 



- 17 18 8 7 - 



36.10 



1.0351 



Do. 



1958 



- 3 27 14 5 1 



36.48 



0.8389 



Streets Ferry 



1954 



4 5 17 18 6 - 



36.04 



1.0806 



