Invasive crayfish are spreading in Oregon, and Sea Grant’s Sam Chan has put together a handy photographic guide to distinguishing three common invasive varieties from American signal crayfish, which is native to the state.
A recent KTVZ report on the invaders prompted several commenters to ask for photos to distinguish them from the native species, so Chan, Sea Grant’s aquatic invasive species specialist and chair of the Oregon Invasive Species Council, is offering the guide as, developed this past summer by his student interns, as a printable .pdf.
