COUNCIL - MARCH 1920 - REPORT — 62 — 



VII. Meeting of the Salmon Committee. 



Sitting: Friday, 5tli March, 1920. 



Dr. K. A. A'ndersson (chairman). 



Present; Dr. A. C. Johansen, Dr. N. Rosen, Dr. T. H. Jarvi, Mr. G. P. Farran, Mr. R. Southern, 



Professor J. Stanley Gardiner (during part of the session). 



Mr. A. E. Hbfford acted as Secretary. 



Expositions of investigations carried out in Denmark and in Sweden were 

 given by Dr. Johansen and by Dr. Rosen respectively. 



The Danish researches, which were mainly conducted in the River Gudenaa 

 in Jutland, dealt principally with the following points: — • 



1) The size and age of the young salmon and sea trout when leaving the river. 



2) Their growth in the sea and the duration of their sojourn there. 



3) The migrations of salmon and sea trout with special reference to the question 

 as to whether they return to their native river. 



4) The question of the effect of the output of artificially hatched fry on the sub- 

 sequent stock of the species. 



The Swedish investigations also had a bearing upon questions of direct 

 economic importance. 



The points dealt with by Dr. Rosen with reference to the salmon of Norr- 

 botten and Vesterbotten and the sea trout in Upper Norrland were principally 

 as follows : — 



1) Age determinations by scale examination. 



2) The duration of the period of life in the river and in the sea. 



3) The growth in fresh and sea water. 



4) Migrations and tiistribution. 



Dr. Rosen also discussed results of similar work in South Sweden and refer- 

 red to the investigations of Dr. Alm and himself on the factors concerned in the 

 growth of the young (fauna and physical conditions of streams and rivers): on 

 the effects of industrial usage of rivers and how far hatchery operations may be 

 utilised to obviate these effects: age groups of running salmon from a certain stock 

 of liberated fry: relation between good spawning years and subsequent catches 

 of running fish: and the relation between growth in the river and in the sea. 



After a general discussion in which reference was made to the salmon questions 

 of Finland, Ireland and England, the Meeting agreed upon various recommendations 

 which should be laid before the Council for adoption. 



See the Resolutions pag. 40 — 43. 



