ABSTRACT 



In the fall of 1952, one hiuidred thousand juvenile American shad, 

 marked by removal of the right pelvic fin, were released in the Con- 

 necticut River. Seventeen marked fish were recovered in the river in 

 1956, 70 in 1957, and 39 in 1958. Ages of the fish, determined from 

 their scales, wei'e 4, 5, and 6 yeare, respectively. These findings were 

 in agreement with known age established from marking and there- 

 fore validate annuli and spawning marks as criteria for age determi- 

 nation of shad. 



