SEA-FISHERIES LABORATORY. 235 
liberated in this area, and the results of the migration 
of this can hardly be considered. ‘The interest of the 
area is that it is one which is inhabited by a considerable 
proportion of spawning plaice. One is more concerned 
with the question of where the plaice found on it come 
from, and we will see that it is possible to answer this 
question. 
The sketch-charts on pp. 258-262 show the approxi- 
mate positions of the places of liberation of the marked 
plaice. The lines enclosing coastal sea areas indicate 
approximately the areas of liberation formed by 
erouping the various experiments. 
The table on p. 236 gives a summary of the results 
of the experiments. 
8. RESULTS WITH RESPECT TO MIGRATIONS. 
We may now consider the general results of these 
grouped experiments. 
1. Luce Bay. 
The plaice marked and liberated are, for the most 
part, immature fish captured while trawling for mature 
plaice for the Piel Hatchery. During the months of 
October and November, 1904 to 1908, five experiments 
were made and 241 fish in all were dealt with. Only 
42 of these, or 17 per cent., have been returned, a small 
proportion, but not surprisingly so when we remember 
that trawling is entirely prohibited in Luce Bay and in 
the Clyde. 
The recaptures, which are unrepresented in the 
charts, fall into three main groups: (1) 21 fishes caught 
in Luce Bay, mainly by means of set nets of about 8-inch 
