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That meant researchers needed to step up their efforts to keep eulachon out of shrimp nets, which are dragged in the ocean about 16 inches above its floor.

Eulachon were listed as threatened and given protections under the Endangered Species Act more than a decade ago.

Researchers aren’t sure why, but the lights can reduce the amount of eulachon bycatch “dramatically,” he says.

But the fine-mesh nets that catch shrimp also catch eulachon.

Eulachon oil burned for light was also carried in the bulbs.