The subject is parasites. Big, black, unsightly ones that local chefs have been noticing lately in the flesh of that delicious denizen of the deep, swordfish. As Roberts explains: “Sometimes you find them when you cut into a big piece of fish. They look like sea worms, and are about a quarter of an inch in diameter.

Is it safe to eat swordfish?

Do not eat Shark, Swordfish, King Mackerel, or Tilefish because they contain high levels of mercury. ... Five of the most commonly eaten fish that are low in mercury are shrimp, canned light tuna, salmon, pollock, and catfish. Another commonly eaten fish, albacore ("white") tuna has more mercury than canned light tuna.

Why should you not eat swordfish?

Swordfish contain high amounts of mercury, a heavy metal with toxic effects on the brain, and it's especially dangerous for babies' brains.