Environmental DNA offers scientists a look at salmon’s past and future

Salmon lie on the deck of a commercial fishing boat. With refinements to eDNA tracking methods, researchers can now collect data about what fish were present in an area up to two days after the fish have left the area.

“eDNA is environmental DNA,” Baetscher said. ” It’s sort of a really simple concept. At its heart, it’s the fact that all organisms shed DNA or genetic material into the environment, and that can be water or air or soil.” “So you know, if you have a really strong current downstream of a whole bunch of fish, do you see that signal changing because the current is changing, or the wind is changing, or the tide is changing? So, you know, we actually need to study the movement of the eDNA separate from the fish to be able to then use that to understand something about fish.”

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