Bull. U. S. F. C. 190: 
Pi atf 1 0 
DIAGRAM SHOWING NUMBER AND SIZE OF YOUNG SALMON TAKEN AT WALNUT GROVE, 1899. 
s indicate number of fry; dotted lines indicate height of river; vertical spaces indicate 10 fry each, or one foot for height of water, or tenths of inch for length of fry; the vertical lines of diagram 
Heavy lines 
J? represent the exact average length of the fry taken. 
