12 



B. B. PARRISH 



In addition to the decline in the total catch and effort already mentioned, 

 the following important changes have taken place: 



(i) Since 1949 there has been a marked drop in the catch per unit of effort, 

 especially in November. Whereas the October catches have fluctuated widely, 



40 



30- 



20- 



NORTH-WESTERN NORTH SEA FISHERY 



-SHETLAND. 



-BUCHAN. Preipawninj (May -July) 



-BUCHAN. Spowning. (Auj-Sipt) 



\o- " 





v-^ 



V 



EAST ANGLIAN FISHERY 



1935 1938 1946 



YEAR 



Pig, 5.— Changes in catch per unit effort in the British north-western North Sea and East 

 AngUan fisheries respectively. North-western North Sea data expressed as crans per landing; 

 East Anghan as thousands of fish per landing. 



but have shown no downward trend, at least up to 1955, the November 

 figures reveal a steady decline since 1949- This is shown in Fig. 5, from 

 data contained in Gushing et al (i959)- 



