> The parasite doesn't appear to bother the fish much, she said, but tapioca disease can make its meat unmarketable and also cause the meat to spoil more quickly, making it a nuisance for the seafood industry: "No one wants to eat salmon full of white dots inside."

In a sense this is, in fact, a symbiotic relationship. It's funny that we'd call it a disease, but this bug is a feature.