398 FISHING IN AMERICAN WATERS. 



cated by the upper half of the screen ; the lower, or left 

 half, merely represents the perforated bottom of zinc. 

 Screen D, for catching the fecundated eggs, is the same- 

 width and length as C, divided into trays also*for remov- 

 ing their contents conveniently. 



The engraving represents the race from the supply pond half 

 way to the outlet of the race into the creek or lower pond. 

 Screen C is open at each end, so that trout from the creek 

 below or the pond above may enter freely, it being an ar- 

 tificial imitation of a natural spawning-bed. The follow- 

 ing is the inventor's description : 



" This race may be built like the races made for the artificial 

 impregnation of spawn used by nearly all trout-breeders to en- 

 tice the trout up from the pond to spawn. It can be made 

 of any length from 10 to 50 feet, and from 2 to 6 feet wide, 

 according to the number of trout which are to use it, and the 

 amount of water for the supply of the pond. It should be 

 made with plank sides and bottom, so tight as to keep out all 

 sediment. Paving the bottom nicely with small stones will 

 answer. The bottom, whether of plank or stone, must then 

 be covered with a half-inch layer of fine, well-washed gravel. 

 "When one has large trout to spawn in the race the water 

 should be 2 inches deep at the upper or supply end, and 15 

 inches deep at the lower end where it empties into the pond, 

 with a gentle current throughout its whole length. This will 

 give good spawning depth to the water for trout of all sizes 

 from 6 to 24 inches long. Usually a race 3 feet wide, and 

 from 15 to 20 feet long, will be quite sufficient for a pond of 

 1000 or 1800 trout. 



" The bottom of this race must be covered with fine wire- 

 cloth screens, of about 10 meshes to the inch, made of zinc 

 or galvanized wire, so as not to corrode, and thus injure the 

 spawn. Iron wire, if painted, will answer where zinc can not 

 be obtained". These wire screens must be nailed to wooden 

 frames, made of inch-square stuff, the frames to correspond in 

 length with the width of the race, and to be as wide as the 



