SEA-FISHERIES LABORATORY. 



127 



Thus 92 plaice were liberated in the entrance to 

 Menai Straits in February, 1907, and at the end of the 

 same* year 29, or about 31^- per cent., have been returned. 

 The results of the experiment are represented in Plate I, 

 and it will be seen that the recoveries fall roughly into three 

 groups : (1) four fishes caught in Menai Straits during the 

 four months after the date of liberation ; (2) eight fishes 

 caught in Liverpool Bay during the summer and autumn ; 

 and (3) a group of ten fishes caught in Red Wharf 

 Bay and Channel Course during the late autumn and 

 winter of 1907. One fish was taken in Holyhead Outer 

 Harbour in a trammel net, two fishes were caught in 

 Carnarvon Bay in June, and one fish went as far South as 

 Dinas Head in Pembrokeshire, where it was caught, also in 

 June. Immediately after liberation one fish migrated to 

 the jNTorth, and was recaught not far from Morecambe Bay 

 Light Ship. 



Experiment 2, 1st June, 1907. 



Station : Two miles North from Bradda Head, Isle of 

 Man. The plaice marked in this experiment were part of 

 the stock of " spawners " kept during the preceding winter 

 and spring at the Port Erin Hatchery. 



Analysis of Sizes of Fishes Liberated. 





12 



m 



l 9 f 



n 



m 



1 



in 



is* 



14i 













No. of plaice 



2 



i 



1 



l 



2 



3 



l 



4 









Size (inches) 



14| 151 



151 



15| 



16 



16| 



19 



19* 





No. of plaice 



4 



9 



2 



l 



1 



1 



1 



1 











