Reply To: Worms In Fish

I would also like to note that if worms are found in the flesh of a mammal, they are not permitted unless they appeared in the animal after it was already dead. This is because while the animal is alive, the worms are considered part of the animal and require shechita. The shechita on the animal does not help for the worms (unlike a fetus) and it is not possible to shecht a worm. After the animal is dead, any worms which appear are muttar. (machlokes, but that is how we hold)