Seaweed is a nursery for all these large pelagic fish.

对所有这些大型中上层鱼类来说，海藻是它们的温床。

And we haven't even gotten into the whole mercury thing yet, where migratory Pelagic fish like tuna absorb toxic metals.

我们还没说到有害物质呢，洄游的大洋性鱼类，比如金枪鱼会吸收有害金属。

" Offshore" killer whales, up to 6.6 metres long, patrol distant waters in pods of 100 to 200 individuals, hunting pelagic fishes like sharks.

“远洋鲸”长达6.6米，以100至200头的群体在遥远水域巡逻，捕食鲨鱼等中上层鱼类。