Fj(;ri:K ID. — ]'.;ittery of .snljiK.n I'l-aiiiii; ponds, larcc sp.iw iiiiii; jioikU .md fishway 

 from stream to ponds at the Little White Salmon Hatchery of the Fish and Wildlife 

 Service. 



The Hatchery Building 



It lias become quite common for 

 modern liatclieries to include in the 

 hatchery building- not only the 

 troughs for the incubation of eggs 

 and the rearing of very small fish 

 but also the service facilities needed 

 in connection with artificial propa- 

 gation : the food-preparation room, 

 cold-storage facilities, garage, shop, 

 office, and often a small laboratory. 

 When the establishment is quite 

 large, it may be more economical to 

 erect a separate garage building. 

 To have all of the facilities under 

 one roof is convenient, usually re- 

 quires smaller initial cost, and re- 

 duces annual maintenance costs. 



Trouf/hs. — Hatchery troughs in 

 the early days of salmon cultiu"e 



were connnonly constructed of red- 

 wood or cedar with inside dimen- 

 sions of about 14 feet long by 16 

 inches wide by 8 inches deep. 

 Although some fish-culturists con- 

 tinue to prefer the shallow troughs, 

 most salmon hatcheries constructed 

 in recent years have been equipped 

 with deep-type troughs, of the same 

 dimensions except that the depth is 

 usually 16 inches. A more modern 

 innovation is a trough 3 feet deep 

 by about 8 feet long which has the 

 same egg capacity as the deep-type 

 trough but requires only about one- 

 half the floorsjDace. Troughs often 

 have been constructed of more mod- 

 ern materials, such as concrete, alu- 

 mininn, and enameled sheet steel. 

 Plastic or plastic-covered troughs 



42 



