1 lilii wV^<r!jr\iN covers about three quarters of the world's 



surface. The coastlines of North America are about 20 percent 



of the world total — but the marine production of the countries 



of this continent is only about 9 percent of the world total. 



The present world catch is about 50 million metric tons. Some 

 scientists believe this is as little as 10 percent of the potential 



catch, perhaps even less. 





... 



