Table 2. — Frequencies of meristic counts from juvenile American shad 

 in samples from the Connecticut River, Conn. , and Mass. 



Table 3. — Frequencies of meristic counts from juvenile American shad in 

 samples from the Hudson River, N. Y. 







Number of 







Location 



Year 



pectoral fin ravs 



Mean 



Standard 





13 14 15 16 17 18 19 20 



deviation 







Frequencv 







Enfield, Conn. 



1954 



3 30 17 - - 



15.28 



0.5729 



Do. 



1957 



7 29 14 - - 



15.14 



0. 6392 



Do. 



1958 



8 23 19 - - 



15.22 



0. 7083 



Holyoke , Mass. 



1954 



- 12 33 4 1 



15.88 



0.6273 



Do. 



1957 



- 16 28 6 - 



15.80 



0.6389 



Do. 



1958 



- 13 33 4 - 



15.82 



0. 5602 





Number of 









dorsal fin ravs 









15 16 17 18 19 20 21 22 







Frequency 





Enfield, Conn. 



1954 



- 6 30 14 - 



18.16 



0.6181 



Do. 



1957 



- 6 33 11 - 



18.10 



0.5803 



Do. 



1958 



- 4 33 13 - 



18.18 



0. 5602 



Holyoke, Mass. 



1954 



- 4 34 11 - 



18.18 



0.5956 



Do. 



1957 



- 1 31 18 - 



18.34 



0.5794 



Do. 



1958 



2 10 20 17 - 



18.10 



0.8864 





Number of 









anal fin ravs 









18 19 20 21 22 23 24 25 







Frequency 





Enfield, Conn. 



1954 



- 8 29 12 1 - 



21.12 



0.6893 



Do. 



1957 



1 8 23 9 9 - 



21.34 



1.0224 



Do. 



1958 



4 11 16 13 6 - 



21.12 



1. 1364 



Holyoke, Mass. 



1954 



1 6 25 18 - - 



21.20 



0. 7284 



Do. 



1957 



1 5 27 16 I - 



21.22 



0. 7365 



Do. 



1958 



2 10 19 16 2 1 



21.18 



1.0039 





Number of scutes 







33 34 35 36 37 38 39 40 







Frequency 





Enfield, Conn. 



1954 



- 5 21 20 3 1 



36.48 



0.8389 



Do. 



1957 



1 4 15 19 11 - 



36.70 



0.9742 



Do. 



1958 



- 4 12 22 12 - 



36.84 



0. 8889 



Holyoke, Mass. 



1954 



1 2 15 23 8 1 



36.76 



0.9161 



Do. 



1957 



- 3 18 21 8 - 



36.68 



0.8192 



Do. 



1958 



- 6 10 16 16 2 



36.96 



1.0872 



only location that had a sufficient number of 

 data for comparing different young, samples 

 taken at Kingston Point only were used to 

 test for differences between years. There 

 were no significant differences between years 

 (1950, 1951, 1954, 1957, 1958) for these 

 samples (table 4). 



Comparison between Connecticut and Hudson 

 Rivers . - -Differences in the meristic counts 

 for the Hudson and Connecticut Rivers samples 

 were tested for significance only for the 

 years for which collections were available 

 from both rivers (1954, 1957, 1958). There- 

 fore, only the collections taken at Kingston 

 Point on the Hudson and at Enfield on the 

 Connecticut were used in the comparisons. 

 The Enfield samples were considered rep- 

 resentative of the Connecticut River popula- 







Number of 







Location 



Year 



pectoral fin ravs 



Mean 



Standard 





13 14 15 16 17 18 19 20 21 



deviation 







Frequency 







Piermont 



1950 



4 20 23 3 



15.50 



0. 7354 



Do. 



1951 



- 23 24 3 



15.60 



0.6061 



Kingston Point 



1950 



2 15 28 5 



15.72 



0.7010 



Do. 



1951 



- 19 29 2 



15.66 



0.5573 



Do. 



1954 



1 19 28 2 



15.62 



0.6024 



Do. 



1957 



- 10 34 6 



15.92 



0.5657 



Do. 



1958 



1 6 36 7 



15.98 



0.5887 



Catskill 



1950 



3 17 27 3 



15.58 



0.6999 



Do. 



1951 



1 27 21 1 



15.28 



0.5771 





Number of 









dorsal fin rays 









16 17 18 19 20 21 22 23 24 







Frequency 





Piermont 



1950 



3 28 13 6 



18.44 



0. 7866 



Do. 



1951 



1 25 20 4 



18.54 



0.6764 



Kingston Point 



1950 



2 24 20 4 



18.52 



0. 7068 



Do. 



1951 



4 18 27 1 



18.50 



0.6776 



Do. 



1954 



3 27 20 - 



18.34 



0.5928 



Do. 



1957 



3 24 22 1 



18.42 



0.6417 



Do. 



1958 



3 24 21 2 



18.44 



0. 6749 



Catskill 



1950 



6 20 21 3 



18.24 



0. 7440 



Do. 



1951 



4 19 26 1 



18.48 



0.6773 





Number of 









anal fin rays 









18 19 20 21 22 23 24 25 26 







Frequency 





Piermont 



1950 



1 5 20 21 3 - 



21.40 



0.8330 



Do. 



1951 



- 4 12 27 4 3 



21.80 



0.9258 



Kingston Point 



1950 



- 7 21 16 4 2 



21.46 



0.9733 



Do. 



1951 



- 6 19 17 7 1 



21.56 



0.9510 



Do. 



1954 



- 10 21 13 6 - 



21.30 



0.9313 



Do. 



1957 



2 12 26 8 2 - 



20.92 



0.8533 



Do. 



1958 



- 10 29 9 2 - 



21.06 



0.7398 



Catskill 



1950 



2 7 17 18 6 - 



21.36 



1.0079 



Do. 



1951 



1 12 20 13 4 - 



21.10 



0.9478 





Number of scutes 







33 34 35 36 37 38 39 40 41 







Frequency 





Piermont 



1950 



- 3 4 17 19 6 I 



37.50 



1.0736 



Do. 



1951 



1 1 7 21 11 9 - 



37.34 



1.1178 



Kingston Point 



1950 



- - 11 15 20 3 1 



37.36 



0.9638 



Do. 



1951 



- 1 10 19 14 6 - 



37.28 



0.9906 



Do. 



1954 



1 2 4 13 20 8 2 



37.62 



1. 1952 



Do. 



1957 



- 1 7 20 15 5 2 



37.44 



1. 0529 



Do. 



1958 



- 4 3 15 26 2 - 



37.38 



0.9666 



Catskill 



1950 



- 1 5 16 20 7 1 



37.58 



0.9897 



Do. 



1951 



- 3 7 25 10 5 - 



37.00 



0.8562 



tion, while the Kingston Point sample was 

 considered representative of the Hudson River 

 population. 



The mean meristic counts for Hudson River 

 shad generally were higher than those of 

 Connecticut River fish. Significant differences 

 were found between rivers for all meristic 

 counts, except anal fin rays (table 4). The 

 interaction between years and rivers was not 

 significant. The significant difference in three 

 of the four counts indicated that discrete 

 populations occurred in each river. 



