-296- 



z 



o 



q: 



I- 



LlI 



O 



o 



X 



o 



3 - 



80 

 60 

 40 

 20 



10 12 





 14 



12 



16 20 24 



100.000 HOOKS / 5° SQUARE 



Figure 13. --Relation between catch and effective effort for black 

 marl in in four areas in the Pacific Ocean. (From Shomura 1980.) 



