Report of Experiments on the Salmonidce of the Tweed. 381 



the larger fish, the scars in reality present evidence that the 

 Salmon bearing these scars were marked as Grilse It may be 

 observed that of the Blacktails, 3, which were recaptured in the 

 months of March and April respectively 144, 159, and 133 days 

 after being marked, had decreased in weight by If, 3£, and 4f 

 ounces— being found in poor condition, and one of them increased 

 in length only 1 inch, while the others were stationary. These 

 still retained the character of Blacktail. The others, which were 

 recaptured in June, July, August, and September, had all in- 

 creased in size and weight, had assumed the characteristics of 

 Whitling or Bull-Trouts, and were generally in good condition, 

 some being retaken in the river Tweed, others on the Sea- Coast 

 Fisheries, and others as far as the North Esk above Montrose, 

 the Coquet in Northumberland, and in the Forth below Stirling. 

 The rate of growth may be illustrated by the following instances : 



(A.) BLACKTAILS EECAPTURED. 



No. of Days 

 after Marking. 

 235 

 231 

 243 

 266 

 292 

 273 

 274 

 277 

 300 

 306 

 312 

 278 

 361 



(B.) WHITLING. 

 June, 1871, 12 „ — „ Whitling. 228 



July, 1872, 12 „ If „ Do. ( ^J^and 



(C.) BULL-TROUT. 



August, 1871, 36 ,, 6 „ Bull-Trout. 320 



Nov., 25 „ 4 „ Do. 413 



(D.) GEILSE. 

 August, 1872, 4i „ 5 „ Grilse. 181 



3c 





Increased 



Increased 



New 





Weight. 



Le; 



agth. 



Character. 



June, 1872, 



2^- oz. 



1£ inch. 



Whitling. 



„ 1871, 



5 „ 



1 



>j 



Do. 



July, 1872, 



m „ 



2 



71 



Do. 



ft 



24 „ 



5 



)) 



Do. 



a 



8 „ 



4i 



>» 



Do. 



}} 



20 „ 



»i 



)t 



Do. 



Aug., 1872, 



9* >, 



4 



If 



Do. 



>> 



4 ,, 



3 





Do. 



}) 



7 „ 



H 



»l 



Do. 



)7 



7 „ 



3 



M 



Bull-Trout. 



it 



15 „ 



8* 



>> 



Whitling. 



>> 



17 „ 



H 



it 



Bull-Trout. 



Sept., 1871, 



17 „ 



5 



)7 



Bo. 



