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Here is a good link: http://www.fao.org/wairdocs/tan/x5951e/x5951e01.htm
It's a cod worm. I encountered these while helping my uncle butcher frozen cod. We would cut around the worm, discard it and continue with the butchering.
I would say "Yes, why not?" but I am sure many people would disagree.
But as soon as I see a worm in a oyster, I freak out.
It's a strange thing. :P