the sampling efficiency for scallops, and large or small catches probably can 

 be related to bottom type as much as the actual distribution. Also, the 

 overall sampling scheme was designed for finfish populations and not for 

 shellfish. 



The autumn and spring length frequencies by strata sets (Figures 2U.7- 

 20.13), are consistent from area to area; growth is too slow to show any 

 seasonal difference with this method of presentation. There are no plots for 

 spring strata sets 2-4 and autumn strata sets 2 and 3 as no scallops were 

 taken in these areas. 



Young-of-the-year scallops do not appear in the bottom trawl survey 

 sampling gear. 



The mid-shelf, non-migratory distribution, combined with high economic 

 value, make scallops one of the more important species to be considered when 

 evaluating man's activities on the shelf. Since scallops are filter feeders, 

 they can be used as test animals for indicators of toxic elements. 



458 



