7月21日晚上，国际自然与自然资源保护联盟（International Union for Conservation of Nature and Natural Resources, IUCN）发布全球濒危物种红色目录更新报告，宣布白鲟（Chinese paddlefish）灭绝，长江鲟（Yangtze sturgeon）野外灭绝。
The International Union for Conservation of Nature and Natural Resources (IUCN) announced the extinction of the Chinese paddlefish and the wild Yangtze sturgeon on Thursday in its updated Red List of threatened species.
据IUCN官网最新报告，全球现存的26种鲟鱼均面临灭绝威胁。名录显示，长江特有物种白鲟已经灭绝，长江鲟野外灭绝，裸腹鲟灭绝。红色名录同时提升了其他7种鲟鱼的保护等级。
The global sturgeon reassessment published by the IUCN on Thursday revealed that 100 percent of the world's remaining 26 sturgeon species are now at risk of extinction, up from 85 percent in 2009.
The reassessment has also confirmed the extinction of the Chinese paddlefish (Psephurus gladius) and that the Yangtze Sturgeon (Acipenser dabryanus) has moved, from critically endangered, to extinct in the wild.
1993年葛洲坝下发现的白鲟，这可能是留存于世最清晰的白鲟照片。危起伟 供图
据了解，长江白鲟有着“中国淡水鱼之王”之称，白鲟体型硕大，可达七八米长。白鲟是距今已有一亿五千万年的中生代白垩纪残存下来的极少数古代鱼类之一。
The Chinese paddlefish is one of the world's largest freshwater fish species with a length of up to 7 meters. It is endemic to China and is flagship species of the Yangtze River.
1989年，白鲟被列为国家一级保护野生动物，于1996年被IUCN列为“极危（Critically Endangered）”，2009年再次评估时被确定为“极危（可能灭绝）”。
此次被提级的三种亚洲鲟鱼包括白鲟、长江鲟和西伯利亚鲟自然种群，其中前两种都是中国母亲河长江流域的代表性水生物种：白鲟2003年最后一次出现在长江宜宾南溪江段。
The Chinese paddlefish was listed as a first-class state protected animal in China in 1989 and was first declared "critically endangered" by the IUCN in 1996. IUCN experts have said there is no image evidence of the species since 2009. It was last seen alive in 2003.
据介绍，在全球范围内，鲟鱼面临的主要威胁包括：野生鱼子酱和鱼肉的非法贸易带来了非法捕捞，水坝阻断了它们的迁移路线，不可持续的沙石开采破坏了它们的产卵场，以及栖息地丧失。
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