Figure 11. — -Upper valve of a sea scallop showing seasonal change in color. 



We have calculated the length at age for the 4 

 years following recruitment of sea scallops to the 

 fishery using both growth-rate equations. 



It is clear that the two equations, derived by 

 different methods, give essentially t lie same re- 

 sults. We. therefore, have confidence in growth 



rates calculated by either method, and that our 

 methods of locating annual rings are valid. 



AGE AT RING FORMATION 



It is interesting to note that, despite the strong 

 check mark put on the shell at time of tagging, 

 the tags apparently did not inhibit growth. Also, 

 if we assume that there is little seasonal variation 

 in the growth rate on Georges Bank, for those 

 scallops that had been out for about a year, we can 

 estimate the time of year when the annual ring is 



:-;ns 



U.S. FISH AND WILDLIFE SERVICE 



