Where Have All the Salmon Gone?

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Use the graph to answer the questions below.
  • Which fish population appears to be the most stable?
  • Fish #3 appears to be prey species for which fish?
  • What do you think is the primary diet of Fish #1? Fish #2? Fish #3? Why?
  • What natural or human events may have accounted for the decrease in Fish #2’s size between years 2 and 4 and between years 16 and 18?
  • What effect did the introduction of Fish #4 appear to have on the other fish species?
  • What actions might the state fish agency have taken to maintain the population of Fish #2?
  • What natural and human events may have caused all fish species to die in year 20?
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