Table 4. --Analysis of variance on meristic counts for differences 

 between locations and between years within rivers, and differences 

 between rivers, for samples of Juvenile American shad from the 

 Connecticut and Hudson Rivers 



Table 5. — Frequencies of taerisclc counts from juvenile American 

 shad in samples from the Susquehanna River, Hd. 



River 



Component 



Degrees 



of 

 freedom 

 (n 1 ,n 2 ) 



F-value 



Connecticut 



Between locations: 



1,296 

 1,296 

 1,296 

 1,296 



2,147 



2,147 

 2,147 

 2,147 



2,296 

 2,296 

 2,296 

 2,296 



4,245 

 4,245 

 4,245 

 4,245 



1,296 

 1,296 

 1,296 

 1,296 









0.680 











Between years: 

 (Enfield Dam only) 























Hudson 



Between locations: 

























Between years; 

 (Kingston Point only) 























Connecticut 



Between rivers: 









12.853** 

 0.915 









Statistically different at 1 percent level. 



Chesapeake Bay Area 



Frequencies of the meristic counts for the 

 samples of juvenile shad from the Chesapeake 

 Bay tributaries are given in tables 5, 6, 7, 

 and 8. 



Susquehanna River . --Only one sample of 

 juvenile shad was available from the Sus- 

 quehanna River, collected in 1958 below Cono- 

 wingo Dam (table 5), so no comparisons could 

 be made. 



Rappahannock River . --Mean meristic counts 

 for the Rappahannock River samples were 

 similar, and tests for differences in the counts 

 between years were not significant (table 6). 

 No comparisons were made, because the only 

 sample taken in each of the two years was 

 taken at different locations. 



York River . --Mean meristic counts for 

 the York River samples were similar between 

 years and locations (table 7). Based on the 



Location 



Year 



Number of 

 pectoral fin rays 



He an 



Standard 





12 



13 14 15 16 17 18 19 



deviation 



Conowingo Dam 



1958 



1958 



1958 

 1958 



Frequency 



- » 36 10 



16.12 



18. 34 



21.28 

 37.22 



0.5206 





Number of 

 dorsal fin rays 







15 



16 17 18 19 20 21 22 





Conowingo Dam 



Frequency 

 - 33 17 - 



0.4785 





Number of 

 anal fin rays 







18 



19 20 21 22 23 24 25 





Conowingo Dam 



Frequency 

 - 8 21 20 1 - 



0.7570 





Number of scutes 







33 



34 35 36 37 38 39 40 





Conowingo Dam 



Frequency 

 - - 7 26 16 1 



0.7083 



Table 6. — Frequencies of meristic counts from juvenile American shad in 

 samples from the Rappahannock River, Va. 



Location 



Year 



Number of 

 pectoral fin rays 



Mean 



Standard 





11 12 13 14 15 16 17 18 19 20 



deviation 



Long Point 

 Batchelors Bay 



1954 

 1958 



1954 

 1958 



1954 

 1958 



1954 

 1958 



Frequency 



5 27 17 1 

 1 22 26 1 



15.25 



15.54 



18.54 

 18.54 



21.64 

 21.38 



36.42 

 36.12 



0.6713 

 0.5789 





Number of 

 dorsal fin ravs 







14 15 16 17 18 19 20 21 22 23 





Long Point 

 Batchelors Bay 



Frequency 



3 20 24 3 

 2 23 21 4 



0. 7060 

 0. 7060 





Number of 

 anal fin rays 







17 18 19 20 21 22 23 24 25 26 





Long Point 

 Batchelors Bay 



Frequency 



- 5 13 29 3 - 

 1 8 16 20 3 2 



0.7559 

 0. 9666 





Number of scutes 







32 33 34 35 36 37 38 39 40 41 





Long Point 

 Batchelors Bay 



Frequency 



- 5 23 18 4 - 

 4 8 22 10 6 - 



0. 7848 

 1.0812 



