Some fish parasites are on the rise, bringing with them risks to human health and fisheries-based economies. Now researchers have a new way to track their numbers—by digging into old records and museum samples. Recent years have seen alarming outbreaks of disease in fish and other marine species, including one that caused a massive die-off of sea stars in the northeast Pacific starting in 2013. But it has not been clear whether this uptick in illnesses was due to an actual increase in the number of pathogens...
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