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 natur; 

 propagation. From egg to downstrean 

 migrating size, salmon are cared for i 

 the hatchery, and natural stream losses ai 

 eliminated. The number of hatchery-reare 

 salmon released to migrate to the sea 

 usually more than 75 percent of the egj 

 spawned. 



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UNerH OF TMB LIFE CYCLi AND OF HATCHFR.V CARE VAR.y WITH SPBCfES AND CONDITIONS 



