SEA-FISHERIES LABORATORY. 241 
4. Red Wharf Bay. Chart V. 
All the experiments made in this area were winter 
ones with one exception, 17-’06. 1 do not propose to 
consider this experiment: it was a small one, and most 
of the fish returned were caught within the area of 
liberation. The winter experiments include 378 plaice, 
and of these 144, or 38 per cent. have been returned. 
With the exception of 8 fish caught near Bahama Bank, 
all the plaice marked were caught in the area where they 
were set free. One experiment was spoiled by the use 
of aluminium labels: in contact with silver this metal 
is rapidly corroded in sea-water, and very few of the 
fishes so marked have been traced. 
The chart shows clearly that plaice set free in the 
** Red Wharf Bay’’ area in the winter months tend to 
remain there for some time; thus most of the recaptures 
were made during the month or two immediately after 
the date of liberation. The modal length of these plaice 
is about 25°5 cms. Considering now the emigrations 
from the area of liberation, we find just what has been 
seen to be the case with the plaice set free in the 
‘Liverpool Bay’’ area, viz., (1) a winter emigration 
along the shore both to the Hast and South; (2) a 
winter emigration to the spawning grounds near the 
‘“ Bahama Bank’ area: the mean length of the few 
plaice making this movement is about 29 cms.; and (3) 
a well marked summer migration to the off-shore grounds 
in ‘‘ Liverpool Bay’’: the mean length of the plaice 
so moving is about 26°5 cms. In addition to these 
movements there is a marked emigration of plaice from 
the Red Wharf Bay area to the South and West of 
Ireland, and to Cardigan and Carnarvon Bays. This 
latter movement may be considered separately. 
