HATCHERY OPERATIONS 



The Fish and Wildhfe Service operates many trout hatcheries in the United States, rearing; 

 brook, brown, cutthroat, and rainbow trout, and some lake trout, as well as the landlocked varieties 

 of Atlantic and Pacific salmon. Trout eggs for incubation in the hatcheries are usually take^. from 

 brood stock reared at the stations. 



The eggs are taken from the female, 

 fertilized with the sperm or milt 

 from the male, and transferred to 

 the hatchery. 



The eggs are placed on trays in 

 troughs through which water flows 

 continuously. Well-aerated water 

 at about 50° F. is used for the 

 incubation of eggs. 



As the yolk sacs are absorbed, the 

 young trout swim up from the bot- 

 tom of the troughs and are fed diets 

 of packinghouse byproducts ; later, 

 livestock feeds are added. 





-V^ 



After further growth in outside 

 ponds at the hatchery, the trout 

 are distributed to suitable public 

 streams and lakes to provide fishing 

 for thousands of sport fishermen. 



