128 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Table II gives the measurements of plaice caught in the 
same area in a shrimp trawl of 34-inch mesh. In order to 
obtain the modal sizes both Tables should be combined. 
It is, however, more convenient to give the measurements 
separately. ‘Table III exhibits the sizes of plaice caught 
in the channels in Morecambe Bay, also by a trawl-net of 
6-inch mesh. These three Tables relate to the measure- 
ments of plaice caught by half-decked sailing boats. 
Table IV shows the measurements of plaice caught also 
in a trawl-net of 6-inch mesh, but worked from the 
steamer ‘“ James Fletcher.’ In all these Tables the hauls 
taken during the same months are combined. 
Table V shows the results of the measurement and 
sex-determinations of rather over 1,000 plaice caught in 
Luce Bay on one day by the s.s. “‘ James Fletcher,” using 
an otter-trawl net of 40-feet spread, and of 7-inch mesh. 
The object of these hauls was to obtain mature plaice for 
hatching purposes, and therefore it was impossible to 
examine the fish for age-determinations. 
Table VI shows the results of the examination of 
plaice caught during 1908, and gives the Age-groups 
based on the examination of the otoliths. Group I 
includes plaice between one and two years of age, IT fish 
trom two to three, and III fish from three to four years 
old. 
Table VII is an attempt to express numerically what 
is meant by the term “ condition of the fish.”” A number 
of plaice were measured individually, and the fish were 
then collected in centimetre groups and average weights 
were calculated. 
The object of these measurements is two-fold: (1) a 
contribution to the life-history of the plaice in the Irish 
Sea; and (2) an attempt to study the changes which may 
possibly result from the relaxation of the trawling 
