SALMO HUCHO. 227 



not. The hucho is found in most rivers 

 tributary to the Danube in the Save arid 

 Laybach rivers always ; yet the general opi- 

 nion is, that they run from the Danube twice 

 a year, in spring and autumn. I can answer 

 for their migration in spring, having caught 

 several in April, in streams connected with 

 the Save and Laybach rivers, which had 

 evidently come- from the still dead water 

 into the clear running streams, for they had 

 the winter leech, or louse of the trout, upon 

 them: and I have seen them of all sizes, in 

 April, in the market at Laybach from two 

 feet long to six inches. It is the opinion of 

 some naturalists, that it is only a fresh water 

 fish; yet this I doubt, because it is never 

 found beyond certain falls as in the Traun, 

 the Drave, and the Save; and, there can 

 be no doubt, comes into these rivers from 

 the Danube; and probably, in its largest 

 state, is a fish of the Black Sea. Yet it can 

 winter in fresh water; and probably many 

 fish never return to the Black Sea, but fall 

 back into the warmer waters of the great 

 rivers, from which they migrate in spring, 



