RIVER PRESERVING AND RIVER POACHING 75 



flourish and do well in one stream will thrive 

 equally in another which may be only a few miles 

 distant. 



The various strata of the soil may be dissimilar : 

 one river may flow through and over chalk ; the 

 other through gravel or perhaps heavy clay : though, 

 as a general rule, such discrepancies do not occur 

 within a limited area. With regard to this, two 

 rather remarkable instances have come under my own 

 observation within the last few years. One occurred 

 in connection with a river, and the other with a moor- 

 land reservoir. 



In the former case a number of fry and yearlings, 

 as well as a few two-year-olds, were procured from a 

 well-known Scotch trout-breeding establishment and 

 placed in the Derbyshire Lathkill. They arrived in 

 excellent condition, and presented no peculiarities 

 whatever. I should add that they were the ordinary 

 Scotch trout, not Loch Levens, or any sort of ' fancy ' 

 fish ; and the river in which they were placed has 

 many of the characteristics of a largish Scotch burn or 

 Highland stream. In fact, as far as I could see, the 

 new trout would find their surroundings with the 

 exception, perhaps, of insect food being rather more 

 prevalent in the Derbyshire river than in the more 

 Northern waters very similar in almost every respect 



