Parasite linked to ‘mushy fish’ could be much more widespread than thought
Researchers are investigating the parasite Unicapsula seriolae, which is linked to 'mushy fish' syndrome in yellowtail kingfish. Recent findings suggest the infection is more widespread than previously thought, affecting fish even before they show physical signs of degradation.
Why it matters
Understanding this parasite is essential for food safety and the commercial fishing industry, as it impacts product quality and consumer confidence in seafood.
Jowena Chua/Getty Images Parasite linked to ‘mushy fish’ could be much more widespread than thought Published: August 18, 2026 9:02pm EDT https://theconversation.com/parasite-linked-to-mushy-fish-could-be-much-more-widespread-than-thought-289212 https://theconversation.com/parasite-linked-to-mushy-fish-could-be-much-more-widespread-than-thought-289212 Link copied Share article Share article
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If you’re a keen angler and regularly catch yellowtail kingfish ( Seriola lalandi ), you may have encountered instances of the fish’s flesh turning mushy and unpalatable once cooked. Some have said it’s a bit like trying to eat wet newspaper.
This can be disappointing for the angler and for the hungry guests you’ve invited to dinner. It is also a waste of food – and of the fish’s life.
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