Table 13. --Frequencies of neristic counts from juvenile American 

 shad in samples from the St. Johns River, Fla. 



Table 14. — Analysis of variance on neristic counts for differences 



between locations and between years within rivers, and differences 



between rivers, for samples of juvenile American shad from 



South Atlantic coast rivers 







Number of 







Location 



Year 



pectoral fin rays 



Mean 



Standard 





12 13 14 15 16 17 18 19 



deviation 







Frequency 







Mandarin 



1954 



1 32 17 



16.32 



0.4518 



Lake Harney 



1954 



7 28 15 



16.16 



0.6503 



Palatka 



1954 



1 38 11 



16.20 



0.5127 



Do. 



1957 



6 27 17 



16.22 



0.6481 



Do. 



1958 



5 37 8 



16.06 



0.5115 





Number of 









dorsal fin rays 









15 16 17 18 19 20 21 22 







Frequency 





Mandarin 



1954 



12 29 9 - 



18.94 



0.6389 



Lake Harney 



1954 



11 24 14 1 



19.10 



0. 7626 



Palatka 



1954 



10 30 10 - 



19.00 



0.6518 



Do. 



1957 



10 33 7 - 



18.94 



0.5859 



Do. 



1958 



11 29 10 - 



18.94 



0.6543 





Number of 









anal fin rays 









18 19 20 21 22 23 24 25 







Frequency 





Mandarin 



1954 



5 19 18 8 - 



21.58 



0.8053 



Lake Harney 



1954 



2 21 21 5 1 



21.64 



0.8020 



Palatka 



1954 



3 19 23 4 1 



21.62 



0.8827 



Do. 



1957 



5 21 19 4 1 



21.50 



0.8631 



Do. 



1958 



2 14 28 6 - 



21.76 



0.7160 





Number of scutes 







33 34 35 36 37 38 39 40 







Frequency 





Mandarin 



1954 



- 3 11 26 10 - 



36.86 



0.9313 



Lake Hamey 



1954 



- 6 11 15 14 4 



36.98 



1.1516 



Palatka 



1954 



- 4 17 21 6 2 



36.70 



0. 8084 



Do. 



1957 



1 6 20 19 4 - 



36.38 



0.8781 



Do. 



1958 



- 4 20 23 3 - 



36.50 



0.7354 







Degrees 



«- of .. 



freedom 





River 



Component 



F-value 







(n 1> n 2 ) 





Neuse 



Between locations: 









Pectoral fin rays 



1, 98 



0.808 







1, 98 



2.023 







1, 98 



1.104 







1, 98 



0.239 





Between years: 







(Bridgeton only) 











3,196 



2.822 







3.196 



3.019 







3,196 



1.732 







3,196 



2.403 



Ed is to 



Between years: 









3,196 



0.649 







3,196 



0.580 







3,196 



0.831 







3,196 



0.606 



Ogeechee 



Between years: 

 (State Park only) 











1, 98 



2.775 







1, 98 



0.092 







1, 98 



0.165 







1, 98 



0.427 





Between years: 







(Kings Ferry only) 











1, 98 



3.685 







1, 98 



0.245 







1, 98 



0.297 







1, 98 



0.846 



St. Johns 



Between locations: 









2,147 



1.170 







2,147 



0.693 







2,147 



0.068 







2,147 



1.043 



a significant difference in the meristic counts 

 between the Edisto and Neuse, the St. Johns and 

 Neuse, and the St. Johns and Edisto in three 



instances ; between the Ogeechee and Neuse, and 

 the Ogeechee and Edisto in two instances; and 

 between the St. Johns and Ogeechee in one in- 

 stance (table 14). These differences indicated 

 that discrete populations of shad occurred in 

 the South Atlantic coast rivers. 



