of the Fishery Board for Scotland. 69 

 Increase of Weight. 



If the fish marked as kelts and recaptured as clean fish be taken in 

 the order of their increase of weight the following result is procured : — 



Tnprpn ^p 



Interval. 



No. 



District. 







l ;■ 1 u I IDS. 



218 days. 



1 1 ^Rr 



TTol iyi crl n 1 a 



_LJLt!l Lllotlttlt/. 



1 9, 



521 





1 OB 



To 



ray. 



1 fil 



691 



» 



9043a 



Tav 

 ±ay. 



J ay. 



1 ^1 



id 4 » 



525 



?) 



OO't / A 



1 9-9 



163 



ti 



OZ t B 



XltUUlSCUllt;. 





o AO 



j? 



/ OOB 



XltJiniffiLltlltJ. 



1U 2 " 



391 



?? 





Brora. 





Oa. 370 



?> 



OO 1 B 



XX (31 mis*. lait? , 



l o 



506 



ff 



J 1 Job 



I I /\ 1 y\i crl q I ri 

 XI t511IlbUd.-l.tJ. 



^2 » 



265 



?? 



9523a 



Deveron, Spey. 





469 



if 



316b 



Stinchar. 



Est. 9 2 " 



514 



ff 



4b 



Tay. 



9 „ 



127 



ff 



202b 



Deveron. 



9 „ 



498 



t ii ' ' ■ i 1 



807b 



Helmsdale. 



9 * 



504 



ff 



1180b 



Helmsdale. 



n „ 



415 



ff 



1203b 



Brora. 



5 „ 



415 



ff 



1223b 



Brora. 



Est. 41 „ 



187 



ff 



209b 



Deveron. 



°2 » 



120 



If 



1243b 



Brora. 



The same great variation in rate of increase, as has previously been 

 remarked, is again apparent — 9 lbs. are gained by one fish in 127 days 

 and by another fish in 498 days. Such extreme contrasts must be ex- 

 plained to some extent by understanding that a fish entering fresh 

 water and spawning on two consecutive seasons cannot grow as rapidly 

 as a fish which remains, it may be, one or two consecutive spawning 

 seasons in the sea. To estimate the condition properly, it seems 

 necessary to classify the records according as fish show short or long 

 periods of sojourn in the sea, and to select records from one river dis- 

 trict alone. Variation in weight is thus found to be not great, fish 

 recaptured after intervals of from 6 to 8 months showing a variation of 

 about 3 lbs., and fish recaptured after intervals of from 12 to 18 

 months a variation of 9 or 10 lbs. 



Addendum. 



Since the above results were compiled the following recaptures have 

 been made : — 



No. 



Lbs. 



Inches. 



Condition. 



Sex. 



Date. 



District. 



749 { 



7 



19 



31 

 44 



. Kelt. 

 Clean. 



F. 

 F. 



9th November 1904. 

 10th May 1906. 



Helmsdale. 

 Helmsdale. 



1186 j 



111 



261 



3; 





F. 

 F. 



12th December 1904. 

 8th May 1906. 



Helmsdale. 

 Helmsdale. 



1167 | 



3 

 11 



3(T 





F. 

 F. 



9th December 1904. 

 16th May 1906. 



Helmsdale. 

 Near mouth of E. 

 Brora. 



The last is not included in the chart showing coastal migrations. 



F 



