Ask any ocean lover to name the biggest threats to ocean conservation and you’ll get a list so long it will make you uncomfortable: derelict fishing gear, increasing underwater noise, invasive species, ocean acidification, overharvest, plastics, toxins, warming water, and so on.
What you probably won’t hear is the word disease—not because the agents of disease are microscopic and out of sight, but because we know so little about how they affect the marine environment. Most people have never thought of parasites and pathogens as agents of change or important ocean stressors.