尤其是河里的中华白鲟已经灭绝了。
为什么白鲟不能人工繁殖？
“中国白鲟太大了，很难人工养殖。”魏说。
"The Chinese paddlefish was so big that it was hard to raise in captivity," Wei said.
然而，据报道，生活在长江的中国白鲟已经灭绝。
However, it is announced that the Chinese paddlefish living in the Yangtze River has become extinct (灭绝) .
白鲟体长约2到3米，可长至7米以上。
The Chinese paddlefish was about 2 to 3 meters long and could grow longer than 7 meters.
它是一种中国白鲟，被誉为“全国淡水鱼之王”。
It's a Chinese paddlefish known as "king of all national freshwater fish".
而宣称是“鲟鱼鱼子酱”的鱼卵其实来自廉价的密西西比白鲟。
And alleged sturgeon caviar was just cheap Mississippi paddlefish eggs.
它是北美体型最大的鲶鱼，并且是北美第三大纯淡水鱼，排在其之前的分别是黄鲟和白鲟。
It is the largest catfish in North America and the third largest obligate freshwater fish in North America, behind the lake sturgeon and paddlefish.
他们还发现了有些人用牛奶来冒充羊奶奶酪、用便宜的密西西比白鲟鱼籽来做所谓的鲟鳇鱼子酱。
A supposed sheep's milk cheese was actually from cows. And alleged sturgeon caviar was just cheap Mississippi paddlefish eggs.
白鲟鱼，一种自恐龙时代就存在的鱼类，现在已经失去了它们在密苏里河沿岸的大部分栖息地了。
The pallid sturgeon, one of a group of fish that has endured since dinosaur times, has now lost much of its habitat along the Missouri River.
最高等级的“培罗加”，是以白鲟的黑或灰色大鱼子制成；新鲜培罗加相当稀少，价钱也十分昂贵。
The Best grade, Beluga, is prepared from large Black or gray eggs; fresh Beluga is relatively scarce and thus expensive.
试图对现有的机械进行改进，使其更有效率； 世界上大多数现存的白鲟鱼子酱是苏联和伊朗生产的。
A large white sturgeon(Huso huso)of the Black and Caspian seas, whose roe is processed into caviar.
可不幸的是，这一工程同样会排走当地野生物保护区庞大的沼泽地里（黑熊、鳄鱼和白鲟鱼栖息处）的水。
U_________(C) , it would also divert water from the region's huge, swampy wildlife refuges, home to black bears and alligators and the pallid sturgeon.
“露莎卡”鱼子酱所用的鱼卵直径在2到3.5毫米左右，比里海大白鲟的鱼卵稍小一些，颜色是淡灰色。
The Rusalka caviar eggs are about two to 3.5 millimeters in diameter, slightly smaller than Beluga caviar, and light gray in color.
“露莎卡”鱼子酱所用的鱼卵直径在2到3.5毫米左右，比里海大白鲟的鱼卵稍小一些，颜色是淡灰色。
The Rusalka caviar eggs are about two to 3.5 millimeters in diameter, slightly smaller than Beluga caviar, and light gray in color.
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