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Fulton* on the East coast of Scotland. Spawning takes 
place on the off-shore grounds out from the mouths of the 
Forth and St. Andrews Bay, and the eggs are borne 
inwards and supply tke nurseries in those waters. Num- 
bers of Plaice on these inshore grounds were captured and 
marked by the attachment of a numbered label, and then 
liberated. After variable periods these fishes were re- 
captured, generally by the fishermen, and then returned 
to the Fishery Board officers. In this way the course 
after liberation was determined, and it was found that a 
slow migration from the South and round the North coasts 
of the Firth of Forth and then round Fife Ness into St. 
Andrews Bay took place, the fishes then moving outwards 
from these shallow waters to the spawning grounds. It is 
certain that some such movement takes place on the Lan- 
cashire coasts, though Fulton’s experiments have not been 
repeated there. The distribution of sizes is, however, 
sufficient evidence, backed with what we know of the 
actual movements in other places. _We have seen that on 
the nursery grounds great numbers of young Plaice of 
about 3 inch long are found during the early summer, and 
owing to the great quantity of these small fishes the 
average size at that time must be very low. ‘Towards 
September, however, these little fishes have entirely dis- 
appeared from the sandy pools, and the numbers of Plaice 
on the grounds slightly off-shore (up to 6 fathoms in 
depth) have greatly increased. ‘These fishes, which are 
now from 2 to 4 inches in length, are the same individuals 
which crowded the sandy pools between tide marks some 
months earlier, and the first part of their off-shore migra- 
tion has begun. 
Further out to sea within territorial waters generally 
the average size of the Plaice caught in the trawl nets is 
* 11th An. Report Scottish Fish. Bd., p. 176, 1892. 
