It sounds like whirling disease[0] in salmonids. I wonder if there's been a change in the water (e.g., temperature or salinity) that's increased the range of p

It sounds like whirling disease[0] in salmonids. I wonder if there's been a change in the water (e.g., temperature or salinity) that's increased the range of parasites (or their annelid hosts) not normally found there? There are a _lot_ of myxozoan species, they fascinate me in that they're Cnidarians, so related to jellyfish and sea anemones, but went the tiny parasitic route instead. Life is amazing and terrifying in its capacity for finding every niche... Not all of them are species specific, e.g., https://en.wikipedia.org/wiki/Enteromyxum_leei https://en.wikipedia.org/wiki/Enteromyxum_leei [0]: https://en.wikipedia.org/wiki/Myxobolus_cerebralis https://en.wikipedia.org/wiki/Myxobolus_cerebralis