956 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF THE CHARTS. 
The charts are all drawn to the same scale, and the 
spots or circles represent the approximate positions of 
recapture of the marked plaice recovered. Obviously 
these positions are only approximate, since in most cases 
it is not quite certain what was the precise position of 
the vessel when the fish in question was captured. Also 
the scale of the charts is so small that in the case of a 
great number of recaptures in a limited area it has been 
impossible to map the positions accurately for each fish 
taken. The charts do not include all the fish returned, 
since it was impossible to trace the position of recapture 
in many cases. In some instances the position has been 
estimated approximately from a knowledge of the 
probable movements of the vessels concerned. 
Cuarrt I. 
This shows the approximate positions of all the 
marked plaice recorded, irrespective of the experiment. 
It is not intended to serve as a representation of the 
measure of intensity of fishing on the plaice grounds of 
the Irish Sea East from Isle of Man, though it will be 
noticed by anyone familiar with the fisheries in this 
area that the recaptures are most numerous just where 
the plaice fisheries are most intense—estimating the 
intensity of the fishery by other means than that of 
marked fish experiments. The recaptures in Carnarvon 
and Cardigan Bays are not charted, since the number of 
fish returned from this area is so small as to render the 
experiments there of little interest. The intensity of 
the plaice fishery here is much less than in the Irish Sea 
North-East from Anglesey. 
Cuarts II ro VI. 
These are explained in each case in the respective 
legend. 
