An anisakid worm (circled in red) in a canned salmon fillet. (Natalie Mastick/University of Washington) ============================================================================================= Canned salmon are the unlikely heroes of an accidental back-of-the-pantry natural history museum, with decades of Alaskan marine ecology preserved in brine and tin. Parasites can tell us a lot about an ecosystem, because they're usually up in the business of several species. But unless they cause some major problem to humans, historically we haven't paid them much attention. That's a problem for parasite ecologists, like Natalie Mastick and Chelsea Wood from the University of Washington, who had been searching for a way to...