18 



THE MIGRATION AND CONSERVATION OF SALMON 



wards down the west coast (Fig. 4). From 

 here the majority of the 58 recaptures were 

 again made on the north and east coasts of 

 Scotland but no marked fish were found in 

 Norway and a rather higher proportion 

 (three north and east for every two west and 

 south) remained on the west coast. 



The distribution of the salmon arriving at 

 this northwesterly part of Scotland was con- 

 firmed by another experiment carried out in 

 1921 on the north coast about 20 miles to 

 the east of Cape Wrath (Fig. 5) . Here very 

 few fish were marked, and of these only nine 

 were recaptured but the nine were distrib- 

 uted as to three on the north coast, four on 

 the west coast and two on the east coast. 



The Scottish experiments, which I have 

 indicated in such a brief manner, seem to 

 show that on the northwest and at the west 

 end of the north coast the indications are 

 that a predominant movement of the salmon 

 from the west exists, and I may here add 

 that this indication is confirmed by an ex- 

 periment which has been started this year 

 further south (at the island of Soay to the 

 south of Skye) on the west coast. All the 

 recaptures (16) of this latter marking re- 

 ported up to mid-June have been on the 



north or east coast with the exception of one 

 fish which was retaken within 20 miles of 

 Soay. 



If we now turn to Professor Dahl's results 

 (Fig. 6) we find a somewhat striking con- 

 firmation of this movement from the west. 

 The first stations in 1935 were outside the 

 island belt at Rong and Titran about two- 

 thirds down the western coast of Norway. 

 From these stations the marked fish distrib- 

 uted themselves both to the north and south 

 of the place of marking. The largest num- 

 bers were caught in nets and rivers compara- 

 tively close to the marking station, but others 

 were found much further away, some as far 

 south as the Swedish coast, others north- 

 wards along the Norwegian coast, one near 

 the North Cape and one in the White Sea ; 

 one salmon left the main lines of migration 

 north and south of the place of marking and 

 crossed in a southwesterly direction to Scot- 

 land. In 1936 work was continued at these 

 two stations and at another at Maelver be- 

 tween the two older stations. The results 

 confirm those obtained in the previous year 

 and, in fact, are very similar except that no 

 fish went round the North Cape and two, one 

 from the northern and one from the central 



Fig. 5. 



