Why do swordfish have mercury?

Chef's answer
Fish get mercury from the water they live in. All types of fish contain some amount of mercury. Larger types of fish can have higher amounts of mercury because they prey on other fish that have mercury too. Sharks and swordfish are among the most common of these.
Frequently asked Questions 🎓
Fish that contain higher levels of mercury include:
  • Shark.
  • Ray.
  • Swordfish.
  • Barramundi.
  • Gemfish.
  • Orange roughy.
  • Ling.
  • Southern bluefin tuna.
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Low in Mercury. Because tilapia is a farm-raised fish -- usually in closed-tank systems -- they have less contact with pollution than other fish. This means they have the least mercury possible. Tilapia is so safe, it gets the official thumbs up for children and women who are breastfeeding or pregnant.
Most of the popular species of fish and shellfish consumed in the U.S. have been shown to have low mercury levels. Seafood choices that are very low in mercury include: salmon, sardines, pollock, flounders, cod, tilapia, shrimp, oysters, clams, scallops and crab..
Farmed salmon has omega-3s, but wild-caught salmon is a richer source of these heart-healthy and brain-healthy fatty acids. Salmon has an average mercury load of 0.014 ppm and can reach measurements up to 0.086 ppm.
King mackerel, marlin, orange roughy, shark, swordfish, tilefish, ahi tuna, and bigeye tuna all contain high levels of mercury. Women who are pregnant or nursing or who plan to become pregnant within a year should avoid eating these fish.
Most of the popular species of fish and shellfish consumed in the U.S. have been shown to have low mercury levels. Seafood choices that are very low in mercury include: salmon, sardines, pollock, flounders, cod, tilapia, shrimp, oysters, clams, scallops and crab..
Low in Mercury. Because tilapia is a farm-raised fish -- usually in closed-tank systems -- they have less contact with pollution than other fish. This means they have the least mercury possible.
A few more cooking questions 📍

What kind of fish does the Bible say not to eat?

`Of all the creatures living in the water of the seas and the streams, you may eat any that have fins and scales. But all creatures in the seas or streams that do not have fins and scales--whether among all the swarming things or among all the other living creatures in the water--you are to detest. What months are crabs in season?;The primary season for all crab species is October to January when they are often at their largest and populations are highest after spawning. Some regions even stretch the crabbing season into July. They aren't hibernating however, they're just lying dormant in the mud, thinking crab thoughts for a few long, cold, lonely months. Such is the life of a crab in the winter. Bake your fish for 10 minutes for every inch of thickness. If your fillet is a half-inch thick, bake it for just 5 minutes. Keep an eye on your catch to make sure it doesn't turn rubbery. Why was my baked cod tough?;Whether I bake or pan-fry there is always at least one piece that has a very tough chewy section. Based on the rest of the pieces, it is not over cooked. What causes the tough area, is it freezing or the original fish. Undercooked cod can also be chewy. Does lemon juice cook salmon?;Lemon juice is a very acidic liquid that you can use to cook" your fish without the use of heat, creating a dish called ceviche that is common in Central and South America. Likewise, does lemon juice kill bacteria in fish? ... It doesn't actually cook the fish.