114 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



REPORT ON EXPERIMENTS WITH MARKED 

 FISHES DURING THE YEAR, 1907. 



(Plates I and II). 



By Jas. Johnstone. 



It was only possible, for various reasons, to continue 

 these experiments during 1907 on a less extensive scale 

 than during 1905-6. We resolved to concentrate the 

 experiments as far as possible, and to confine our attention 

 to the summer plaice fishery in Liverpool Bay, and to the 

 autumn and winter plaice fishery that is carried on in Red 

 Wharf Bay and in Channel Course. Three experiments 

 were therefore made, (1) in Menai Straits in February, 

 1907, when about 100 small plaice were caught by the 

 '' John Fell " and liberated close to the place of capture ; 

 (2) near Nelson Buoy at the entrance to the Ribble 

 Estuary in July, 1907, when about 150 plaice were caught, 

 also by the " John Fell," and liberated on the ground 

 where taken ; and (3) in Red Wharf and Beaumaris Bays 

 in October, 1907, where 120 plaice were caught and 

 liberated. I intended to mark and liberate plaice and 

 flounders in the neighbourhood of the Lime and Wyre 

 Rivers, and in Barrow Channel, but did not find this 

 possible because of the other engagements of the " John 

 Fell " and the Fleetwood police cutter. In June a number 

 of plaice which had been kept during the preceding year 

 in the spawning pond, at the Port Erin Hatchery, were 

 turned out into the sea, and at Prof. Herdman's request I 

 sent a number of labels to Mr. Chadwick, Curator of the 

 Biological Station, who then marked 28 large plaice and 

 liberated them near Bradda Head. 



During 1907 we, therefore, marked 360 fishes, all plaice 

 with one exception, and at the time of writing (16th 



