COUNCIL — APRIL 1912 — APPENDIX F — 106 — 



3) Investigations as to the natural conditions on which the growth and breeding of salmon 



in their native haunts depend. 



A. As to the situation and extent of spawning grounds of the salmon and 

 sea-trout; also depth of water and nature of bottom. 



B. As to the variations in temperature and amount of water in the river. 

 Also formation and movements of ice, especially at the spawning grounds of both 

 mentioned fish. 



C. As to the food-supply of the salmon in the river in question; for 

 instance, nature and quantity of food present. 



D. Experiments with a view to discovering what percentage of the eggs 

 laid by the salmon in a state of nature develope into healthy young. 



4) Investigations as to the effect of precautions taken to secure or increase amount of 



salmon in the river in question, and determination of the precautions 



to be taken to this end. 



A. As to the precautions which have been, or could be taken, to facilitate 

 or render possible the upward passage of the salmon, or the migration of young 

 fish to the sea, as for instance by placing of salmon ladders, or apparatus calcu- 

 lated to prevent the young fish from entering mill wheels, etc. 



B. As to the laws and local regulations relating to salmon fishing, close 

 seasons and protected waters, and as to the effect of such precautionary measures 

 upon the quantity of fish. 



C. As to the means taken to enforce such measures. 



D. As to the liberation of salmon fry. 



It is especially desirable that the importance and results of artificial fish 

 culture in the countries concerned should be tested by experiment. In which con- 

 nection the following points should be particularly noted: 



a) To state in what kind of apparatus, in what water (river water or spring 

 water) and at what temperature the eggs are hatched. 



b) Quantity of egg-fry annually laid down; place and time. The exact de- 

 scription of the locality is desirable. 



c) At what stage of development the fry was laid down, how much laid 

 down every year; place and time; also whether previously fed; if so, how long, 

 and what food employed. 



d) Quantity of young fish set free, stating age, or size (or both) also place 

 and time. Here should be taken into consideration: 



1) Whether the young fish are kept in ponds, by dams or otherwise, strength 

 of stock, and percentage of mortality. 



2) Whether artificially fed, if so, with what and for how long? 



3) The expense incurred hereby should also be stated. 



