The last fish worm infestation I encountered where those little worms that are rolled up in the flesh and when picked out they uncoil and are about an inch long. The were in a dog salmon I was brining for smoking. What the heck, there's gross stuff in almost all of our food. Some things you see and others you don't. Have you ever seen those things that look like tumors in beef? Even becoming a vegetarian won't get you away from it. One time while visiting my mom for dinner I thought her home grown broccoli tasted funny. After eating about half of a big serving I noticed a generous portion of little green grubs mixed in. I don't think any of these things will hurt you if its cooked, they just don't look good.