56 



DRIFT NET. 



TRAWL. 



1911— North Shields 



1912— Do. 



1913— Do. 



Q, U, V, W, X 



N. O 



P, R, S, T 

 P 



12^5— 21^3 

 12— 21^5 



12— 211 

 12^7— 20-8 

 13^7— 21-1 

 14^3— 201 



15—21 

 16— 2 i 



* Scale-covered portion of body 



The tangents of the measurements give numbers which do not 

 differ markedly, but it will be at once seen that where there is a 

 difference, the difference remains constant, that there are in fact 

 one or two characters which serve to define the trawl from the drift 

 net herring. The dorsal fin on the whole is placed further back, 

 and is certainly longer in the trawl herring. The ventral fin is also 

 more posteriorly situated in the trawl herring. The smaller length 

 of the drift net herring is also brought out. An attempt has been 

 made with reference to certain of the samples to find out whether 

 there is also a sexual difference, but the method is evidently not 

 sufficiently fine to indicate the small amount of difference between 

 the sexes. 



The results so far as distribution is concerned of the samples 

 examined are indicated in the accompanjmig chart, the Dogger 

 Bank race being distinguished by *. 



It is concluded therefore that the summer herring of the east 

 coast of Northumberland and Yorkshire belong to a race which 

 presents a uniformity of character, serving to define them as such. 

 The race may be caught up to a distance of 60 miles at least from 



