KNUT DAHL. 



remote fresh waterstreams and lakes continually and gradually 

 migrate into the sea. In other words a very little noticeable, 

 and very little noticed development from the freshwater forms 

 to the sea form of the trout takes place in our waters. 



I need hardly add, that this phenomenon though common 

 applies only to a proportionally small number of individuals 

 of the freshwater forms. On the other hand however it is 

 perfectly clear, that the economy of the sea-trout is influenced 

 thereby. It is also not improbable that the phenomenon may 

 influence locally the economy of the trout forms of the fresh 

 waters. 



Chapter V. 

 Practical conclusions. 



a. Protection of young fish in general. 



From my investigations, more fully described in chapt. II, 

 it appears, that it must be considered an established fact, that 

 young salmon between 13 — 16 and 45 — 50 cm. in length are 

 practically speaking not to be found in those of our waters where 

 people fish for salmon and trout. 



Evidently then regulations tending to protect these stages 

 are unimportant to the economy of the salmon and the salmon 

 fisheries. With the practical problems, mentioned in the intro- 

 duction in view, it is however just as obvious, that these 

 regulations must be altered in favour of the trout-fishery, 

 which certainly may be predicted to yield considerable profit as 

 soon as a rational working of this fishing is facihtated. 



The only question is, by what means and in what degree 

 this may be effected by legislation. In the following pages I 

 will endeavour to develop the views which in my opinion are 

 justified by the scientific material at hand. 



If we examine the regulations by means of which our legis- 

 lation has intended to provide for the protection of smaU salmon 



