24 



THE MIGRATION AND CONSERVATION OF SALMON 



TitJ 



Fig. 11. 



Migrations of salmon marked at Stav0y, Agdenes, Norway, in 1936. 



S0MME.) 



(From Dahl and 



ous. Marking continued from May to Sep- 

 tember and the number of nets in the neigh- 

 borhood was considerably less than in any 

 part of the Moray Firth. This last experi- 

 ment, and the Moray Firth results in gene- 

 ral, have been strikingly confirmed by the 

 marking station at the mouth of the Trond- 

 heim Fjord (Fig. 11) from which only two 

 fish have been recaptured a few miles on the 

 sea side of the fjord and all the rest actually 

 in the fjord itself or in a river running into 

 it. 



This series of experiments in the north- 

 east side of Scotland and in Norway seem to 

 show that once the salmon, many of which 

 on certain parts of the coast may be on pass- 

 age, have reached the neighborhood (within 

 40 or 50 miles) of their destination they are 



prepared either to proceed straight up the 

 river or to remain within the distance indi- 

 cated, or a shorter distance, of the river until 

 such time as they are able to go upstream. 

 And the closer they get to the river mouth 

 the shorter will be their migrations while so 

 waiting. 



The whole of the experiments are not by 

 any means inconsistent with a feeding 

 ground for the salmon at some indeterminate 

 distance to the west of Norway and Great 

 Britain from which an easterly migration 

 takes the fish to the coasts after their feed- 

 ing period is finished. On the Norwegian 

 coast the fish spread either north or south to 

 the final river, but it is possible that some 

 Scottish fish may pass to the north of the 

 country and touch Norway before they reach 



