220 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



1938 



1939 



1940 



1941 



1942 1943 



YEAR-CLASS 



1944 



1945 1946 1947 



1948 



Figure '.). — Ratios of numbers of pilchard of each year class taken per unit-of-effort al San Pedro to those taken along 

 the whole Pacific coast as 1-riiiK (dot), as 2-ring (circle). Numbers offish of each year class taken per unit-of-effort 

 at the 3-ring stag" are shown (symbol x) as relative measures of year-class strength. 



