174 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Table II. 



Net used 



Average number 



of Shrimps per 



hour 



Average number 



of Undersized 

 Fishes per hour 



Average number 

 of Young Fishes 

 taken with each 

 quart of Shrimps 



Shrimp Trawl... 

 Shank Net 



5-J Quarts 



U 7 J5 



6,1751 



1,642| 



1,155 

 239| 



young fish, and this with no loss or even a small gain in 

 capture of shrimps. The shank-net hauls were made 

 partly with the ordinary form, and partly with the patent 

 Bar-net. Table III. shows the relation between the 



Table III. 



Kind of net used 



Average number 



of Undersized 

 Fishes per hour 



Average number 



of Shrimps per 



hour 



Average number 

 of Undersized 

 Fishes taken 



with each quart 

 of Shrimps 



Ordinary Shank 

 Bar Shank 



553 

 508-5 



2-1 

 2-2 



263-3 

 231 



catching-powers of these two nets, the values being 

 obtained in a similar way to those for shrimp-trawl and 

 shank-net. It will be seen that the bar-net is slightly the 

 superior both in avoidance of young fish and in capture of 

 shrimps. Tables IV. and Y. give the average catches per 

 hour with one shank-net and one shrimp-trawl 

 respectively, of plaice, dabs and shrimps on the Blackpool 

 Closed Ground for the four seasons. The figures were 



