Salmon disappearance could bring fishing ban

• Story Highlights
• 90,000 salmon in California's Central Valley last year, down from 775,000 in 2002
  
• Wildlife officials say salmon numbers below what's needed to maintain population
  
• Meeting this week could put total ban on salmon fishing off California, Oregon coasts
  
• Not clear whether decline caused by problems in ocean, rivers, or both
  
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