26 B. B. PARRISH 



problem is currently the subject of intensive investigation, involving a more 

 sophisticated analysis of the effective effort exerted by the fisheries in the 

 northern and southern North Sea. Steps are being taken through the 

 International Council for the Exploration of the Sea to improve and extend 

 the statistics of fishing effort and to examine further the distribution, ecology 

 and identity of the herring exploited in the northern and southern North Sea. 



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Ann. biol. Copenhague, 9, 179-80; lO, 155-6; n, 125-7; 12. 197-8. 

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