WHAT IS A SEA TROUT 355 



him a letter in relation to it, of which I enclose 

 you a copy, and I am sure that he would be very 

 glad if you would write him anything bearing on 

 the subject which may be within your knowledge 

 or experience. 



Yours very truly, 



CHARLES S. DAVISON. 



I therefore feel that, backed by such competent 

 authorities as those above cited, we can well say 

 we have two distinct species of trout in our rivers. 

 Continuing my investigations with regard to 

 salvelinus oquassa, I found that they were irregu- 

 lar in their migrations and that although many 

 followed and associated with S. fontinalis in 

 their ascent of the rivers, the majority spawned 

 in or near tidal waters. I have also observed that 

 both species of trout are liable to a contagious 

 disease of a fungoid character that attacks their 

 gills and fins. I have witnessed two such epi- 

 demics since I have been here. These are gener- 

 ally confined to one river. The last one I saw 

 was on the Trinity River, in 1879, when hundreds 

 of trout were found dead strewn on the beach in 

 the vicinity. 



