Lesson Plan

Freeing the Elwha (Hatcheries, Saviors or Scourge for Wild Salmon?)

Pink salmon.

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Grade Level:
Sixth Grade-Eighth Grade
Subject:
Aquatic Studies, Biodiversity, Biology: Animals, Ecology, Environment, Wildlife Biology, Wildlife Management
Duration:
Two Class Period
Group Size:
Up to 36
Setting:
classroom
National/State Standards:
Washington State Standards:
Science:
EALR 4: 6-8 LS3A, LS3E, LS2B
Social Studies
EALR 5: Component 5.2
Writing
EALR 2: Component 2.1, Component 2.2

Overview

Hatcheries seem like a good idea, but they are fraught with problems, how are hatcheries both a danger and a blessing to wild fish?

Background

This lesson focuses on the history and roles that hatcheries serve in sustaining commercial fisheries, native fish populations, and saving endangered fish stocks. Hatcheries were historically a popular tool for propagating large numbers of fish for sustaining commercial fisheries, however, a series of problems have resulted in increasing controversies over their use. Some of the problems include the use of non-native stocks, the development of non-competitive behaviors, and over-stocking fish beyond the natural carrying capacity of the environment at the expense of wild native fish. However, as wild fish runs become threatened with extinction, hatcheries are also proving to be a valuable tool for saving these wild native runs.

  • Hatchery: A facility used to rear juvenile fish for the purpose of stocking rivers or lakes, producing fish for commercial fishing activities, or restoring endangered fish populations.
  • Carrying Capacity: The largest number of individuals an ecosystem can support, based on food availability, behaviors, and space limitations.
  • Gene pool: The total number of genes of every individual in an interbreeding population. A large gene pool indicates high genetic diversity, increased chances of biological fitness, and survival. A small gene pool indicates low genetic diversity, reduced chances of acquiring biological fitness, and increased possibility of extinction.

Materials

  • Lesson 17- Hatcheries, Saviors or Scourge for Wild Salmon.pptx
  • Reflection Journal pages (printable handout)
  • Vocabulary notes (printable handout)
  • Hatcheries, Saviors or Scourge for Wild Salmon? Pro and con handout.

Procedure

Additional Resources

http://www.farmedanddangerous.org/

Vocabulary

Hatchery
Carrying Capacity
Gene pool