PLATE XXX. 



A 34 LB. HEN SPRING FISH, NORWAY, MAY 2isr, 1909. 



At A it shows 5 annular rings added after its first spawning visit, other 

 and outer rings having possibly been denuded away. 



At B it shows 17 or 18 additional rings added for the same period. 



At C it shows the irregular manner in which the annular additions are 

 added to the scales. 



The sixteen ring theory seems to be contradicted by this scale. 



The smooth outside edge of a fresh run fish is well shown. This scale 

 also shows the irregular character of denudation, which accompanies and 

 follows a spawning visit. 



Photographed and enlarged by Mr. J. Arthur Hutton. 



