56 On Stocking. 



be narrow, not over two feet wide at bottom, and 

 any convenient length ; two square feet of bottom 

 per thousand eggs is the minimum space advisable, 

 and five square feet per thousand eggs the maxi- 

 mum. A redd two feet by twenty feet will hatch 

 out a box of from 15,000 to 20,000 Ova safely, 

 but when practicable it is better to make smaller 

 redds and more of them. 



The depth of water in a redd should be from 

 three to six inches, not less than three or more 

 than six. The sides of a redd are best left as cut 

 out of the soil, and sloped as little as possible so 

 as to shade the redd, which should also be covered 

 with open hurdles or fir branches anything in 

 fact which will freely admit the air and modify 

 the light. Light is one of the worst destroyers 

 of trout-life, especially in the earlier stages. 



The inlet of the redd may be either a four or 

 six inch pipe not larger than six, or too much 

 water may be passed through the redd in time of 

 flood. The inlet should be taken off the stream 

 in a wooden box guarded with perforated zinc, 

 to prevent small trout or sticklebacks entering 

 and feeding on the alevins. The outlet should 

 have a fall arranged to effect the same purpose. 

 Mice are sometimes troublesome, but do not feed 

 in water over four inches. Water-rats, however, 

 must be guarded against, as they are greedy 

 feeders below water. It is not advisable to fence 



