COUNCIL — SEPT. 1910 — APPEND. D — 72 — 



Carefully kept statistics enable us to follow the life-history of the plaice in 

 the variation of the median interval, also the nature of the diminution of the stock 

 in contrast to that on virgin grounds (e. g. Barents Sea), the degree of the fishing, 

 the meaning of the commercial classes and many other things. 



Dr. Dahl gave a lecture on the age and growth of the Salmon and Sea- 

 trout in Norway , as determined by the scale-method. The age of the smolts on 

 leaving the rivers of Norway varies from 2—5 years, averaging § years. The 

 salmon taken in Norway are mostly unspawned fish which have been 1 to 3 except- 

 tionally 4 years in the sea. The proportion of fish with a spawning mark on the 

 scales is small (2 — 10 per cent.) compared with the total. In Southern Norway 

 the Salmon are on the average younger than in Northern Norway. The growth 

 of the parr is very slow, the average size of the sraolts at 3 years being 12— 13 cm. 

 Similar information was given with regard to the trout. 



H. M. Kyle 



