In my opinion there is no doubt that marine mammals should NOT be held in captivity. Marine mammals are a part of nature and should not be bought, sold or thrown in an aquarium. I believe that they have the right to be kept in their natural environment. I have many convincing reasons to support my opinion.
Captivity causes many health problems in marine mammals.
Marine mammals in captivity die from pneumonia, ulcers and other stress-related diseases. Most of these helpless creatures suffer from boredom. Some of these poor innocent creatures face abusive treatment by their caretakers, thus shortening their life span. In fact Keiko, the killer whale, the star of Free Willy, was a victim of this type of abuse. It was known to be said that he was 1,000 pounds underweight and developed a wartlike disease.