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The Miracle Fish

This lesson explores the consequences of introducing Nile Perch into Lake Victoria. Once home to 300 unique fish species, the lake has seen dramatic ecological changes since the Nile Perch's introduction in the 1950s to combat overfishing. While it has created jobs and increased fish availability, many native species have gone extinct, and algal blooms have risen due to a disruption in the food chain. Students will analyze the long-term effects of this introduction and discuss potential alternative solutions for managing fish populations.

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The Miracle Fish

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  1. The Miracle Fish 3-26-12

  2. 3-26-12 Bell Work: • What do you think would happen if all the big fish in a lake ate all the little fish in the lake. • Explain your answer.

  3. Daily Review: • What does a food chain show you?

  4. Review: If you do not want a pet anymore, what should you do with it? • Leave it at a park. • Return it to the store. • Let it go free. • Any of these options.

  5. 3-26-12 Objective: • I will decide if the Nile Perch should have been put into Lake Victoria. • HW: E-9 #6

  6. Video

  7. Notes: • 300 different types of fish used to be found in Lake Victoria. • 99% of these fish could not be found anywhere else. • By the 1950’s the lake was being overfished. • The Nile Perch were secretly added to the lake to help with the fish shortage.

  8. Notes: • Many fish species in the lake have become extinct due to the Nile Perch eating them. • Some of the fish ate algae. Now the algae growth in the lake has increased. • More people have jobs now. More fish to feed more people. • Nile Perch may be running out of food.

  9. E-3

  10. How did the amount of fish caught in Lake Victoria change from 1960-1989? • How did the introduction of Nile perch affect the food supply of the people who lived near Lake Victoria? • What effect did the introduction of Nile perch have on the organisms that lived in the lake? • What do you think will happen to Lake Victoria in 20 years?

  11. Closure: • Was it a good idea to put the fish in the lake? • Could they have done something else?

  12. Long Term Memory Review • Why do organisms have adaptations?

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