Pelagic sharks are usually caught on the high seas in tuna or swordfish fisheries.

深海鲨鱼通常在公海中被金枪鱼或旗鱼的捕捞渔业捕获。

This is less than the total biological production in the main water column, or pelagic zone.

它比主水体或远洋区的生物总产量要少一些。

I'm busy in pelagic business.

我忙于远洋商业。

The ship is engaged in pelagic fishery.

这艘船从事远洋渔业。

Plankton and nekton are pelagic organisms.

浮游生物和自游生物都是海面的生物。