淡水海豚仅产于恒河、印度河和亚马逊河。因环境污染和严重捕杀，淡水海豚数量急剧下降，到2006年时长江水域的淡水海豚已经灭绝。在未来的50年内，淡水海豚将可能成为第一种灭绝的哺乳动物。
一直在长江和相邻湖泊生活长达两千多万年的江豚和淡水海豚，科学家们估计它们在15年内将会灭绝。
Scientists estimate that the finless porpoise, a freshwater dolphin which has lived in the Yangtze River and adjacent lakes for over 20 millions years, will become extinct within 15 years.
海豚是哺乳动物，人们可以在世界上大多数的海洋和淡水中找到它。
They are mammals that can be found in most of the world's oceans, as well as in fresh water.
甚至某些人对海马、海豚、小丑鱼，以及其它比绚丽的淡水鱼外形更加奇特、颜色更加耀眼的海水鱼特别感兴趣。
There is also an interest in sea horses, puffers, clown fish and other salty types with shapes more strange and colors brighter than even the showiest of. fresh-water fish.
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