CHAPTER X. 



GRAYLING. 



i F the water on which the work of 

 " Making a Fishery" is to be at- 

 tempted already contains grayling, it 

 is, on the whole, advisable to abstain from 

 trying to increase the stock by the introduction 

 of fry or yearlings purchased from any outside 

 source. In a stream favourable for this species 

 of Salmonidcs the natural reproduction is so 

 rapid as not to require assistance from ex- 

 traneous sources. The result of such assistance 

 is usually to produce an undue preponderance of 

 grayling in a river with the concomitant dis- 

 advantage of their being generally of small 

 average size. If, from the action of a heavy 

 flood, or other cause, the grayling should be 

 found to have worked down out of the par- 

 ticular stretch rented, it may be advisable to 

 stock up a little, but even in this case it should 

 be done sparingly. 



