A STUDY ON TROUT AND YOUNG SALMON. 



247 



The sizes mentioned above, differ quite inconsiderably from 

 the size limits of the salmon found by me in our waters. 



However it is just the intermediate stage, between smolt 

 and grilse, or the so-called „Forell"-stage, which has occosioned 

 the difficulties in discerning salmon and trout. 



In his great work on the salmonids „Kritisk förteckning 

 öfver de i Riksmuseum befindÜiga salmonider", Professor Smitt 

 bas compiled a table on this stage. As his method of examina- 

 tion demanded as large numbers as possible, of course he must 

 have mustered all the specimens availeable. 



On revising this table however one will be astonished at 

 finding only the following salmon; 



Pg. 50 we thus find: 



Tab. No. 



173 



172 



166 



171 



167 



161 



Length in cm. 



20.4 



17,3 



15,9 



17,2 



16,0 



14,5 



By looking up his metrical tables (the Tab. No.s above re- 

 fering to these) I observe, that the specimens all are from the 

 „Motala ström" by Norrköping with exception of No. 161 which 

 is from the lake Venern (Kannikenäset). 



Upon closer examination I find that these salmon in no 

 mean degree differ from those kvown from other places. 



The 3 smallest differ considerably from the smolls of our 

 rivers and also from smolts from other swedish rivers of which 

 the collection of the Riksmusmuseum contain many of a little 

 smaller size. 



The 2 largest ones No. 173 and No. 172 are higly different 

 as well from the salmon I found in the Bergen museum as 

 from those I have reared myself. 



They possess many characters reminding of those of the 

 trout. Thus the form of the body is clumsier, the tail shorter, 

 the fins larger and the scales smaller than in salmon. The 



