I have asked sushi chefs (in HK) once or twice about whether they have seen worms in their shashimi. It kinda breaks the ice and gets the conversation going… I recall being told that Japanese do not favour salmon because of worms.
I would imagine…if completely cooked. It would not be a problem, but some fish is not completely cooked. I cant define the definition of completely… but most food grade items are mass served above 160 or at least 145.
Actually there are no regs on this that I am aware of. We candle(use a light table to inspect) all of the fillets in our products and don’t allow worms. Can’t vouch for everyone in the industry. They are a naturally occuring parasite and generally not harmful, but obviously are very disturbing to most consumers, hence our zero tolerance.
I will eat most foods with the exception of many innards. I tried sea cucumber in a Korean restaurant once and it was unpalatable. I will not make that mistake again.
When we lived in SoCal, we ate swordfish once or twice a week. During that time - over twenty years; I don’t remember ever seeing (or tasting) worms in the swordfish. Admittedly the swordfish was all locally sourced.