A recent study published in the journal Ecology and Evolution reveals that old cans of Alaskan salmon, stored since 1979, have provided scientists with valuable insights into marine ecology. Researchers found that the prevalence of anisakid parasites in salmon species increased over the decades, particularly in pink and chum salmon. This rise in parasites, typically viewed negatively, may actually indicate a recovering marine food web and healthier populations of marine mammals, which are crucial for the parasites' life cycle. The study analyzed 178 cans of salmon, recovering 372 worms, and highlighted the importance of archival collections in understanding long-term ecological changes. While live anisakids can pose health risks when consumed raw, the canning process eliminates these concerns for consumers. The findings underscore the complex interactions within marine ecosystems and the potential impacts of climate change on these dynamics, suggesting that increased temperatures may enhance parasite growth and distribution.