Dolphins are killed for food, and captured for entertainment in Japan. They kill them in the same areas where they have dolphins swims for tourists. Tens of thousands are killed every year.
"The hunts are notoriously brutal and blue tarpaulin sheets block the main viewing spots overlooking the cove where the killings take place to prevent picture-taking. Beyond the cove, a small fleet of boats surround a pod of migrating dolphins, lower metal poles into the sea and bang them to frighten the animals and disrupt their sonar. Once the panicking, thrashing dolphins are herded into the narrow cove, the fishermen attack them with knives, turning the sea red before dragging them to a harbour-side warehouse for slaughter."
http://www.japanfocus.org/_David_McNeill-Taiji__Japan_s_Dolphin_Cull_and_the_Clash_of_Cultures/Sea Shepherd Taiji Dolphin Campaign
www.seashepherd.org/taiji