25 



The age composition of these samples was as follows :- 

 Winter Rings. 



The trawled herrings were sent to the Laboratory from Shields, 

 and although it cannot be stated that the samples w^ere true samples 

 of the fish caught, it is significant that amongst the younger fish 

 those with three winter rings were most plentiful, and these fish 

 gave in the followmg year a high percentage of fish with four winter 

 rings, and then formed the predommant year group. 



