Neil
Well-Known Member
I think it's the case that (could easily be wrong on this) that EU and US food regulations both require sushi fish to be frozen to -20C for at least 24 hours to kill off any parasites and especially worms which can cause various intestinal ailments. I understand that mackerel alongside some farmed salmon are fairly high on the risk scale.
This is correct, though I have eaten (very) fresh mackerel sashimi on the boat to no ill effect. Large tuna are exempt - I should be so lucky!