On a longline fishing boat off the Galapagos Islands, a concerned biologist working undercover as a cook films a horrifying scene. As the camera rolls, a blue shark is dragged upside down out of the water, a sharp hook piercing it through the roof of the mouth and out through the side of the face...

Humans are fascinated by the intelligent and gregarious nature of the dolphin. As one consequence of this fascination, dolphins are commercially exploited in marine parks, aquaria and "swim-with-the-dolphins" (SWTD) attractions worldwide. In the United States, the Department of Commerce's National...