A STUDY ON TROUT AND YOUNG SALMON. 



As regards certain important systematical questions, I have 

 in an essential mesure had to fall back on the rearing of young 

 fishes. These rearing experiment were effected in the aquaria 

 of the Trondhjem biological station. 



The main collections of salmon and trout, belonging to 

 Scandinavian museums, have been examined by me. 



It is needless to mention, that in all my yournys I have 

 constantly communicated with fishermen and gained knowledge 

 from their experience. Also from other people interested i 

 these fisheries valuable information and assistance has been 

 obtained. 



Chapter II. 

 The Investigations. 



a. Seines. 



The investigations commenced, in the beginning of May 

 1898, in the lower course of the Orkla and in the mouth of 

 this river. 



Fishing with the eelhandseine, in the river mouth, during 

 the first days of the month, only yielded a few trout. 



In using a rod with worms as a bait, I succeded in ascer- 

 taining, that the young of two different species of salmonids 

 were to be found higher up the river. One could with certainty 

 be determined as young trout, the other was just as certainly 

 young salmon. Specimens are represented in PL I, and I will 

 not here enter into a detailed description of their different cha- 

 racters, as I later will return to this matter. 



By fishing with the eelhandseine in the same locahties I 

 could catch larger numbers of them. 



By way of example I quote the yournal: 



Evjen (Evjenskilen) Orkla May 10, 1898. 



Two houls with the eelhandseine yielded: 13 youg salmon 

 9,5 — 12 cm. long. 



