SEA-FISHERIES LABORATORY. 123 
(3) The Spring and Summer Migration. 
This is from inside and about the 5-fathoms line, into 
deeper water out at sea. The plaice which are over 20 cms. 
long travel almost due west out to the 20-fathom lime, and 
none go beyond this. Most of them are recaptured between 
the 10- and 20-fathom lines. About 50 per cent. of the 
recaptured fish are between 224 and 26 cms. in length: 
30 fish were recaptured. 
(4) The Autumn Migration. 
This begins in August. The plaice begin to move back 
again in-shore toward shallow water. Those plaice recaptured 
in August were all taken from an area extending from about 
Morecambe Bay Light Vessel, on the north, to about Liverpool 
North-west Light Vessel on the south. The western boundary 
of this area is about half-way between the 10- and 20-fathom 
limes, and its eastern boundary is about half-way between 
the 10- and 5-fathom lines. Of the plaice recaptured in 
August inside this area 50 per cent. were between 22 and 244 
ems. in length, that is, the fish were rather smaller than the 
June-July caught ones, a decrease probably due to fishing-out 
of the larger individuals: 28 plaice were recaptured. 
September-October. 
The majority of the plaice are still migrating in-shore, 
to the eastward, during these months. About 70 fish were 
recaptured, and about half of these were still found inside 
the area occupied in August, but much further to the east. 
About half had moved to well in-shore from this area, so that 
the “front” now held is just inside the 5-fathom line. In 
addition to this easterly migration into shallower waters 
there are also indications of four other lines of migration. 
