Hatcheries seem like a good idea, but they are fraught with problems, how are hatcheries both a danger and a blessing to wild fish?
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.
Review Essential Question; introduce Guiding Question.
Students should take a few minutes to respond to the first reflection prompts. Discuss their answers and any questions they've generated.
Hand out the Vocabulary Notes. With this lesson you may want to define the words before presenting the PowerPoint Lesson.
Present the PowerPoint Lesson.
Pass out the Hatcheries, Saviors or Scourge for Wild Salmon? handout. Have students do some research and reading about hatcheries. While they are researching they can fill out the chart on the handout. After the students have filled the columns with reasons for and against hatcheries, have them draft a paragraph at the bottom of each column defending and rejecting hatcheries. The object is for students to examine both sides of a controversial issue. The can take this information further into a formal paper, a debate, or save it with the other lessons they have compiled as a resource for the final project in Lesson 19.