aMON 



NATURAL LIFE 



The diagram shows the life cycle of salmon. 

 Adults may spawn near the ocean or hundreds 

 of miles upstream. Each female produces up 

 to 8,000 eggs, depending on species and size. 

 Since predators, floods, silt, freezing, and 

 drought destroy many eggs and young fish, the 

 number of young salmon migrating to the sea 

 is probably less than 10 percent of the number 

 of eggs spawned. 



HATCHERY PHASE 



The salmon hatchery supplements natural 

 propagation. From egg to downstream- 

 migrating size, salmon are cared for in 

 the hatchery, and natural stream losses are 

 eliminated. The number of hatchery-reared 

 salmon released to migrate to the sea is 

 usually more than 75 percent of the eggs 

 spawned. 



£66S f\ND YOUNe 



^R£ CARED FOR /N 



THE mrcHERY 



IN THe PACIFIC 



2 TO 5 YEARS 



'«*'^ 



UP TO 16 MONTHS 

 OF LIFE CYCLE 



F/NGERUf^eS 

 ARE RELEASED 

 //SW STREAMS 



"^ L£N6W OF W LIFB CYCLE AND OF HATCmRy CARE VARY WITH SPECIBS AND CONDITIONS 



