51 
AGE DETERMINATIONS IN THE COMMON DAB, 
LONG ROUGH DAB AND WHITING. 
By A. M. CARR, B.Sc. 
The fish used for these determinations are the same as those 
used in the former paper, though only in the case of the dab, long 
rough dab, and whiting was there material to indicate the mean 
size at a given age. In the dab and the long rough dab the age 
has been determined by otoliths, and in the whiting by scales. 
As is shown in the tables following, the fish were taken for the 
most part during the winter period of growth, and therefore the 
results refer mostly to fish completing the year’s growth. 
In the common dab and long rough dab, when the age is 
determined by otoliths, it is difficult to say, without a complete 
range from the youngest fish, exactly what part, in the centre of 
the otolith stands for the first and second years. 
In the whiting in which the scales were used, there is not this 
same difficulty in the youngest stages. 
Below is a comparison of the sizes in some of the year groups 
obtained by this and the Petersen method (Prof. Meek in the 
Northumberland Sea Fisheries Report, 1905, and Dr. Fulton in 
the Report of the Fishery Board for Scotland, 1905). 
