SEA-FISHERIES LABORATORY. YAS 
the results of these experiments to enable us to conclude 
that such migrations of the larger plaice inhabiting our 
area do naturally take place on a large scale. In fact, 
one may probably conclude with some degree of 
certainty that the small plaice population in the eastern 
side of the Irish Sea originates from the larve spawned 
to the South in St. George’s Channel and transported to 
the North-East round the coast of Anglesey with the 
Gulf Stream drift, which, as Dr. Bassett* has shown, 
gradually increases in strength during the spring of the 
year, at such a time when the plaice are probably 
spawning. But the contrary migration is a rare one, 
that is, few plaice migrate from the Hast coast of Ireland 
over to the West coast of Hngland, and few migrate 
from the Welsh bays round Holyhead to the coasts of 
Lancashire and North Wales. None of the plaice marked 
and liberated by the Irish Department of Agriculture 
and Technical Instruction on the East coast of Ireland 
has yet been traced to the English side of the Irish Sea, 
and of the 229 plaice liberated in Carnarvon and 
Cardigan Bays only five have been recovered from the 
sea North-East from Anglesey. 
(4) One further regularity may be mentioned. The 
’ grouped experiments include 395 
‘“ Morecambe Bay ’ 
fish, and less than one per cent. of these have undergone 
the migration to the South and West round Anglesey 
or across the Channel. The ‘‘ Liverpool Bay’’ experi- 
ments include 545 fish, and about 24 per cent. of these 
have made the same migration. Tinally, the ‘‘ Red 
Wharf Bay’’ experiments, including some 420 fish, 
have been the most fruitful in this respect, for rather 
over 5 per cent. of them have migrated to the Hast and 
South. But one must remember that the modal length 
* « Ann, Rept. Lancashire Sea-Fish, Laby. for 1909,” p, 148. 
