I found this research of dolphin. Dolphins face a greater number of threats to their species survival today that at any other time during their evolution and at a time when there are more acts designed to protect them than ever before. We select below a few of those issues that require serious attention and make dolphin conservation a pressing need the world over. Dolphins and Yellowfin Tuna are always found swimming together. The reasons for this are not fully understood but we believe the tuna are taking advantage of the dolphin’s ability to find prey as they frequently feed on the same species. Fishermen have long noticed this association and have sought to exploit this association by fishing close to groups of dolphins. This practice was commonplace in the Pacific from the 1950's onwards and resulted in the deaths of thousands of dolphins caught up in purse seine nets employed to catch the tuna. Many countries continue to allow hunting of dolphins for aboriginal, cultural or subsistence purposes. Dolphins and small whales are killed and used for food, oil or other traditional uses and their products cannot legally be traded.
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taken from http://whalewatchwestcork.com/dolphin-conservation.html
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