古老鱼种重返伊利诺斯州水域 分享到
Ancient Fish Returns to Illinois Waters 2017-08-1151892

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The Illinois Department of Natural Resources is returning a fish called the alligator gar to the state’s rivers.
伊利诺斯州自然资源部将一种名叫鳄雀鳝的鱼类迎回该州水域。
Some people call the fish a "living fossil." Experts believe the fish first appeared during the Early Cretaceous period more than 100 million years ago.
一些人称该鱼为“活化石”。专家认为这种鱼首次出现于白垩纪早期,1亿多年前。
Randy Sauer is an Illinois state fisheries biologist. He says the fish disappeared from the state’s rivers in the 1990s, although they have continued to do well in southern states.
兰迪.萨奥尔是伊利诺斯州渔业生物学家。他表示这种鱼在20世纪90年代消失在该州的河流中,但还在美国南部各州存活。
Sauer says biologists want to bring the fish back to northern rivers because it is important to have top predators to balance the species below them, he said.
萨奥尔说生物学家想让鳄雀鳝重返北部地区河流,“因为重要的是让食物链高层食肉动物平衡它下面的低层物种。”
Sport fishermen like to try to catch the alligator gar. Alligator gar are the second-largest freshwater fish in North America. They can grow as large as 2.7 meters and weigh more than 136 kilograms. Sauer says their large size is one reason they disappeared in the 1990s.
专业的钓鱼者都想抓住鳄雀鳝。鳄雀鳝是北美洲第二大淡水鱼。它们可以长到2.7米长,重量可超过136公斤。萨奥尔说,它们体型过大也是在20世纪90年代消失的原因之一。
Experts say alligator gars are "opportunistic feeders." This means they will eat almost anything -- including small turtles or ducks. They also eat invasive species such as Asian and silver carp. Sauer hopes the re-introduction of the alligator gar will help the state’s efforts to control the carp.
专家说鳄雀鳝是“机会主义取食者”。这就是说他们几乎什么都吃,包括小型龟或者鸭子。他们还会吃掉入侵物种,例如亚洲鲤鱼和银鲤。萨奥尔说,重新引进鳄雀鳝将会帮助该州控制鲤鱼数量。
Because gar can live up to 60 years, the program will continue to increase for many years.
因为鳄雀鳝可以活六十年,该项目将持续很多年。
Sauer notes that female alligator gars do "not sexually mature until 11 years, and the male not till 6 or 7 years."
萨奥尔指出,雌性鳄雀鳝“11岁才会性成熟,而雄性则是六到七岁。”
That means the biologists will try to raise and release a lot of fish early in the program to re-introduce them.
这意味着,生物学家们将在项目早期培养和放生很多鱼用于重新引进这一物种。
We’re probably going to stock more heavily than 10 or 20 years down the road when hopefully these fish will find each other and start doing the job on their own, Sauer says.
“我们备有的鳄雀鳝大约10到20岁大,不久之后希望这些鱼可以找到彼此,自己完成使命,”萨奥尔说道。
Small devices have been placed in 7,000 of the fish so they can be observed after they are released into the waterways of Illinois. As it rains and floods, biologists expect some of the fish will follow the rivers into the states of Louisiana and Texas.
一些小的装置被放置在7000条鱼上,这样就可以在将它们放入伊利诺斯州的河道后对它们进行观察。生物学家们希望,在大雨和洪水过后,一些鳄雀鳝可以沿着河流进入路易斯安那州和德克萨斯州。
I’m Mario Ritter.
马里奥.里特为您报道。

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