The shark described a circle around the shoal of fish.

这条鲨鱼围绕着鱼群游动。

《牛津词典》

Mercury levels are high in marine fish, too—particularly in larger species, such as shark, tuna, and swordfish.

海洋鱼类中的汞含量也很高——尤其在体型较大的鱼类体内，如鲨鱼、金枪鱼和旗鱼。

youdao

Will a shark prefer to eat a human or a fish?

鲨鱼会喜欢吃人还是鱼？

youdao

One reason is that overfishing of sharks and related fish has reduced the size of some shark populations.

VOA: special.2009.06.16

The British scientists had requested the pictures to learn if the shark was the same fish they had observed on their side of the Atlantic.

VOA: special.2009.06.16

The risk increases as off-shore pollution increases and as more people eat more fish including shark.

CNN: Beware of shark meat, FDA warns

Larger fish such as shark, king mackerel, swordfish, and tilefish tend to be highest in mercury because they eat smaller fish and consume the mercury in them as well.

CNN: Seafood benefits outweigh risks, government says

Levels of mercury in fish other than shark, swordfish and marlin did not give cause for concern.

BBC: Predatory fish health warning