Abstract 



Population growth and industrial in- 

 crease have intensified the problems of 

 salmon-fishery maintenance. Natural 

 propagation has been interfered with by 

 pollution and by dams that cut off the 

 salmon from their natural spawning 

 grounds. Hatchery propagation helps 

 maintain the fishery by offsetting the loss 

 in natural spawning. This review of 

 salmon-hatchery operations describes the 

 life history of the Pacific salmon and ex- 

 plains the equipment used and the methods 

 followed in hatchery propagation. 



