126 THE SEA-TROUT 



9331 B. Marked, Altnagairoch Burn Nov. 1913 



Recaptured, Altnagairoch Burn ... ... Nov. 1914 



8328 B. Marked, Altnagairoch Burn Nov. 1913 



Recaptured, Altnagairoch Burn (ist time) ... Nov. 1914 

 Recaptured, Altnagairoch Burn (2nd time) ... Nov. 1915 



8346 B. Marked, Smiddy Burn(?)* Nov. 1913 



Recaptured, Altnagairoch Burn ( ?)* Nov. 1914 



8347 B. Marked, Smiddy Burn Nov. 1913 



Recaptured, Smiddy Burn Nov. 1914 



* There may easily be an error here in conjusing the place of marking or 

 recapture, as fish taken in both burns are often carried from one to the other 

 by the hatchery men. The two burns enter Luss Water ivithiji a stone's 

 throw of each other. 



In addition, two marked Loch Lomond fish have been recaptured 

 in nets in the Clyde estuary near the Leven mouth, which suggests that 

 the fish were " homing " towards Loch Lomond ; and another (besides 

 928 B) previously marked in the Arn Burn, was caught two years later 

 by an angler in the loch in the immediate vicinity of that burn. It 

 should be stated that no fish marked in one tributary (with the doubtful 

 exception noted above) has been recaptured in any other tributary. 



If it be thus proved, then, that mature sea-trout return to Loch 

 Lomond in two consecutive years and even in three consecutive years, 

 and not only so but are found again in the same trifling tributaries (the 

 Altnagairoch, Smiddy and Arn Burns), as well as in the larger streams 

 (Luss and Finlas) in which they were marked, there is surely nothing 

 surprising in the fact that the shoals of ascending whitling should 

 return to the locality whence they descended as smolts. That each 

 shoal is actuated by an impulse to travel in the one direction convinces 

 me that it is one shoal returning to known grtnind and not a fortuitous 

 gathering of individuals travelling at haphazard towards the unknown. 



Another thing which led me to form the conclusion that particular 

 shoals of sea-trout retain cohesion was this. At one time the river 



