34 



Fish will go into this shallow graveled race, into the 

 quick running water, to free themselvus from the para- 

 sites which often trouble them ; or they will go there if 

 they are out of health and condition from any cause. 

 This raceway must be filled with coarse gravel, and the 

 bottom of the pond made to slope gently up to the race- 

 way. 



The head of the raceway is to be carefully looked 

 after. If a series of ponds are made, then the screens 

 between will keep the fish from running from one to the 

 other ; but if single ponds are used, each supplied wiih 

 separate water from a stream, then much attention must 

 be paid to the screens where the water enters. It would 

 be well if the water was brought into the pond through 

 a long box, as the water will- very soon work aiound or 

 under a short box, and allow the fish to escape. If the 

 water enters with a fall, it may be allowed to pour over 

 upon an apron, constructed of thin slats, one-half or one- 

 quarter of an inch apart, and set, edgeways. This will 

 let the water through and keep the fish from running up. 

 Trout will run up stream very freely, working their way 

 through a small passage, but will not try much to run 

 down stream. 



Wild Raceway. — If the ponds are connected with a 

 stream in which there are trout, it is desirable if possi- 

 ble to make a raceway below the lowest dam and con- 

 nect it with the stream, so that wild fish may use it. In 

 this way a great many trout ^ill be taken in a ripe 

 condition that would otherwise spawn in some other 

 part of the stream and be lost. The wild raceway has 

 the advantage not merely of utilizing fish that have not 

 cost any expense to keep, but of adding to the number 

 of spawners for the following year by the addition of 

 those that are thus captured. 



