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Coho salmon DNA detected in air at Issaquah Creek — Level A1 — a piece of fish sitting on top of a box

Coho salmon DNA detected in air at Issaquah CreekCEFR A1

8 Dec 2025

LevelA1A2B1B2

Adapted from U. Washington, Futurity • CC BY 4.0

Photo by J F, Unsplash

Level A1 – Beginner
2 min
79 words
  • Last fall many salmon moved up a nearby river.
  • Researchers collected salmon DNA from the air there.
  • They worked close to a salmon hatchery.
  • The study looked at Coho salmon in fall.
  • The team put air filters beside the river.
  • The filters caught salmon DNA near the water.
  • The DNA in air was much less than water.
  • This idea may help find where salmon are.
  • Scientists will study weather effects next.
  • The work was done by a university team.

Difficult words

  • researcher — a person who studies and finds facts
    Researchers
  • hatchery — a place where fish eggs are kept
  • filter — a tool that cleans air or water
    air filters, filters
  • collect — to get and bring together things
    collected
  • effect — a change that happens because of something
    effects

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever seen salmon in a river?
  • Would you like to visit a hatchery?
  • Do you think air can carry small things like DNA?

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