TROUT FLY-FISHING IN AMERICA 



THE EYESIGHT OF TROUT 



For instance, in clear streams that are shallow and not 

 too fast running, be they large or small, the eyesight of 

 trout is at its best, and their vision is remarkably keen. On 

 the other hand, in fast running streams, where necessarily 

 the surface of the water is considerably fretted, also in 

 deep streams which are fast running and in streams, be 

 they shallow or deep, which are discolored or roily, the 

 vision of trout is less effective, due entirely to these ad- 

 verse conditions. 



Trout are only made less keen of vision when adverse 

 conditions prevail over which they have no control, and 

 this is equally true when the normal eyesight of mankind 

 is considered. 



Changed conditions produce different results with 

 every creature that lives and has eyesight. 



The angler cannot see as well and as clearly under 

 water as he can when out of it, and it is undoubtedly as 

 true that trout can see better in the water than when they 

 are out of it. Therefore, it follows that each must have its 

 natural element in order to obtain its normal and best 

 vision. 



How often has the angler, walking along a small 

 stream, seen trout lying under its banks or behind a boul- 

 der or hassock ; but has it not been after his eye has become 

 accustomed to looking through the water that he is able to 

 see them? 



If the angler on the bank remains motionless and does 



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