36 FISH CULTURE. 



eaten, as they are then getting out of season. If transferred 

 about this time or a little earlier they are not so heavy with 

 spawn as to be affected by change of habitat, and will be- 

 come accustomed to their new home by spawning time. 



In the proportions I have given for ponds, the fish are 

 more under the control of the owner and can be fed with 

 greater certainty and regularity than in those which ap- 

 proach a square or circle in shape, and the ponds can be 

 easily dragged with a seine so as to secure every fish if 

 necessary to clear it. 



As the fish in pond No. 1 do not. spawn at the age they 

 inhabit it, a raceway with the requisites for breeding is 

 not necessary. The water should be led in through two 

 or more shallow rills from a foot to two or three feet wide, 

 according to the supply. If bulkheads made by setting 

 narrow boards edgewise, put out from each side alternately, 

 nearly to the middle of the rills, they will create a zigzag 

 current and form eddies for the fry. These bulkheads may 

 be set from four to eight feet apart, the distance apart being 

 proportioned to the length of the races. The bottom of the 

 race, though, should also be covered with gravel. 



This question of course will present itself to the reader : 

 How many trout will a supply of given volume and tempera- 

 ture keep in healthy condition ? In reply, I will cite a case 

 on which I have in a great degree based my estimate; I 

 have already referred to it in " The American Anglers' 

 Book." — Owen Desh, at Hellertown, Penna., has a spring in 

 his garden, the temperature of which we will suppose to be 

 51°, and the volume one and a half inches square; it flows 



