TREATMENT OF YOUNG SALMONOIDS AND COEEGONI. G93 



So far, at least, it has been my experience that saibling which were 

 placed in the water at the same time with trout of an equal size were 

 rarely caught again, although these fish, if alone in the same water, con- 

 tinued to flourish. 



Wherever, therefore, it is not possible to place in lakes which already 

 contain saibling several hundreds of thousands of these fish, I would 

 advise not to place them in the open water until they have reached the 

 age of one to two years. The same may be done by a pisciculturist 

 who can only operate with 1,000 to 2,000 trout-eggs, provided that he 

 has a chance to raise his trout for one to two years, according to the 

 dictates of nature, in inclosed but tolerably large waters. 



It is not advisable to place in open waters trout which one to two 

 years have been fed on brain, meat, &c, in narrow inclosed waters. 

 [Such fish must be raised to the age of maturity in inclosed waters. 



Where are the young fish to be placed? Young fish which are able 

 to swim had therefore best be placed in locations which naturally-born 

 fish would prefer. For trout and salmon this would be a place in a brook 

 containing a good many stones and aquatic plants. It does not matter if 

 the current is pretty lively if it only does not become a rapid or waterfall. 



The young trout and salmon will here soon find suitable hiding-places 

 among the stones and aquatic plants, and it will not be long before they 

 begin to hunt for little aquatic animals. It need scarcely be mentioned 

 that it is best to distribute the fish over as large a space as possible. 



It will hardly be possible to select a place for the restless coregoni. 

 Care should only be taken that these tender young fish are not placed 

 in bays of lakes, in ports, &c, because the numerous cyprinids gener- 

 ally gathered in such places might mistake the little coregoni for small 

 worms, and therefore devour them. 



It is therefore advisable to place the young coregoni in the middle of 

 the lake and let them select the most suitable dwelling-places. 



I would, finally, ask all pisciculturists, beginners as well as those pos- 

 sessing much experience, to examine carefully all I have said. I feel 

 convinced that, after a careful and conscientious examination, every think- 

 ing pisciculturist will abandon the injurious spring-water theory and 

 adopt the less convenient but more natural method of hatching the fish 

 in brook-water. 



