Do Fish Pee?

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Freshwater fish pee almost constantly, while saltwater fish pee very little. Scholars investigate the concept of homeostasis with a video lesson comparing fresh and saltwater fish. An episode describes how some fish absorb water, while others lose water due to osmosis and the concentration of salt in the water around them.

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CCSS: Adaptable
Instructional Ideas

  • Incorporate during a unit on homeostasis
  • Follow the lesson with a lab investigation demonstrating osmosis
Classroom Considerations

  • Expects a basic understanding of homeostasis
Pros

  • Uses animations to demonstrate concepts
  • Includes humor for added engagement
Cons

  • None