MILA 

 Nz 



26 

 24 

 20 

 16 

 12 



e 



4 



B 



15 



MiLA 

 Nz 



-30 

 -20 

 - 10 



A 



25 



-20 



15 

 10 



■c 



MILIONI 

 Kg 



-ISO 



-100 

 ■ 60 



20 



1770 80 90 laOO 10 20 30 40 50 60 70 80 90 1900 10 20 30 40 



Figure I. Diogram of the catches; smoothed by nine years, of the fisheries of; A, group of 



the Department of Tavira (Portugal); B, Medo das Cascos (Portugal); C, Sidi-Daud 



(Tunisia); D, P. Scuso I. Plana (Sardinio); E, fishery for herring at Bohuslan 

 (Johansen), data not smoothed. 



TN; The upper part of the vertical axis represents thousands of fish, the lower 

 part millions of kilogroms. 



19 



