HALIFAX - Many anglers catch-and-release trout; but in early July, Steve Campana was part of a team of researchers catching, tagging and releasing four-metre porbeagle sharks.

Putting a satellite tag on a shark can be an "exciting exercise," Campana, a shark researcher, said Monday.

Hooked and landed on the boat deck, the animal thrashes wildly. To calm it down, Campana and the others placed a wet cloth over the shark's eyes and then attached a saltwater hose to its mouth to pump salt water over the gills.

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