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100 

 90 



80 

 70 

 60 



50 



40 



30 - 



20 - 



10 - 



9 

 8 



7 

 6 



5 

 4 



2 - 



Fig. 11.- -Rates of decline in nuabers of tags returned. Upper line represents 

 50 percent rate of decline; lower line, 75 percent. Symbols as 

 followss X, Montauk, N. T., 1932; circle. Loner Chesapeake Bay, 

 1931; triangle, Exmore, Virginia, 1933; square, Pamlico Sound, N. C, 

 1932; dot, Pamlico Sound, 1937. 



63 



