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Fish Hatcheries Savior or Scourge for Salmon? FREEING THE ELWA
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Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

Dec 21, 2015

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Page 1: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Fish HatcheriesSavior or Scourge for Salmon?

Page 2: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

How Hatcheries Work

Page 3: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Fertilizing sperm and eggs

Page 4: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Raising Fry

Page 5: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

The Larger Life Stages

Page 6: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Out-planting to the Wild

Page 7: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Why Don’t Hatchery Fish Survive Very Well?

O Non-competitive behaviorO Non-native stocks

Feeding Time

Non-native Eastern Brook Trout are often released into

Washington rivers

Page 8: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

Danger of Hatcheries

O Non-native stocksO Swamping and CompetitionO Disease Transmission

Page 9: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

The ArgumentsOSome argue that hatcheries have saved salmon

from going extinct.OSome argue the over-use of hatcheries have

caused wild salmon stocks to decline faster.OSome argue hatcheries have uses that should be

on a case-by-case basis, such as in saving critically endangered runs.

Page 10: Fish Hatcheries Savior or Scourge for Salmon?. How Hatcheries Work.

FREEING THE ELWA

This project was made possible in part by a grant from

Washington’s National Park Fund.