Table 2. — Atlantic menhaden purse seine catch, in thousands of metric tons by 



year and area. 



vessel week,^ cannot be adjusted directly to units of 

 effective effort. Why it cannot are discussed in detail 

 by Schaaf and Huntsman (1972), who estimated 

 changes in effective effort indirectly. 



'A vessel week is 1 vessel fishing for 1 wk. 



CATCH, EFFORT, AND CATCH 

 PER UNIT OF EFFORT 



North and Middle Atlantic Areas 



The annual catch in these areas prior to 1963 

 constituted up to 65% of the total catch, but by 1966 it 



