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VOA常速英语2017--鳄雀鳝重返北美水系

时间:2017-08-02 23:07来源:互联网 提供网友:nan   字体: [ ]
    (单词翻译:双击或拖选)

Alligator1 gar are the second largest freshwater fish in North America. Later it disappeared from the state's waterways in the 1990s.

鳄雀鳝是北美第二大淡水鱼。后来,也就是20世纪90年代的时候,水域中就再没发现过这种鱼。

We want to restore the ecosystem2 because it is important to have top predators3 to balance the species below them in order to keep check on some more abundant species.

我们想修复这里的生态系统,因为很重要的一点是,顶端的捕食者要捕食他们下面的物种,这样才能控制住一些物种的数量,不会过盛。

Fisheries biologist Randy Sauer says, Beyond that, alligator gar make for some big game fishing. The diamond-scaled animals, which can breathe both air and water, can grow up to 2.7 meters and weigh more than 136 kilograms. In fact, their large size is what did them in originally in the state.

渔业生物学家兰迪(Randy Sauer)表示,除了这些原因之外,鳄雀鳝也促成了一些捕鱼活动。这种巨型动物可以呼吸空气和水分,能长到2.7米长,136千克重。事实上,它们庞大的体型正是造就他们在美国初始境地的原因。

It was pretty much extirpated4 out of its range because of misconceptions about it eating sport fish, he said. People would target it and put bounties5 on it.

曾几何时,鳄雀鳝几乎遭到捕杀灭绝,因为人们误以为它会娱乐用鱼为食。人们会以捕猎鳄雀鳝为目标,并对此悬赏。

The alligator gar is an opportunistic eater, meaning it will eat whatever it encounters — from an occasional turtle or small duck to invasive species such as Asian and silver carp. Sauer hopes the re-introduction program will help the state's efforts to control the carp.

鳄雀鳝是一种积极的捕食者,也就是说,它遇到什么就吃什么——无论是偶然邂逅的乌龟、小鸭子,还是具有进攻性的物种(比如亚洲鲤鱼和白鲢)。兰迪希望,本次引入鳄雀鳝的项目能帮助美国控制亚洲鲤鱼和白鲢。

Because gar can live up to 60 years, this program is going to take decades to fully6 expand.

由于鳄雀鳝寿命可达60年,因此这个项目要完全展开将需要数十年。

The female alligator gar does not sexually mature until 11 years, and the male not till 6 or 7 years, so at the outset of this project 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.

雌性鳄雀鳝到11岁时才具备交配能力,而雄性鳄雀鳝也要到六七岁的时候才有交配能力。所以,现在这个项目刚开始,我们很可能要做好等10年甚至20年的准备,才能看到雄雌鳄雀鳝发现彼此,并进行自发交配。

To date, 7,000 alligator gar have been fitted with transponder tags so that they can be tracked and then released into Illinois waterways. As it rains and floods, biologists expect some of the fish to follow the rivers all the way down to the Louisiana and Texas.

目前为止,已有7000只鳄雀鳝被装载了应答器标志,这样就能追踪他们的行踪,放他们进伊利诺斯州的各大水路中。随着雨季和洪水的来临,生物学家预测,一些鳄雀鳝会沿着水路一路下游到路易斯安那州和德克萨斯州。


点击收听单词发音收听单词发音  

1 alligator XVgza     
n.短吻鳄(一种鳄鱼)
参考例句:
  • She wandered off to play with her toy alligator.她开始玩鳄鱼玩具。
  • Alligator skin is five times more costlier than leather.鳄鱼皮比通常的皮革要贵5倍。
2 ecosystem Wq4xz     
n.生态系统
参考例句:
  • This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
3 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
4 extirpated f3b98d2ea00ef5eded5520357eac578f     
v.消灭,灭绝( extirpate的过去式和过去分词 );根除
参考例句:
  • Many species have been extirpated from large areas. 许多种动物已在大片区域内灭绝。 来自辞典例句
  • The brigands have never been really extirpated from the neighborhood of Rome. 罗马附近的土匪实际上从来没有真正被消灭干净过。 来自互联网
5 bounties 14745fd05fd9002f5badcb865e64de92     
(由政府提供的)奖金( bounty的名词复数 ); 赏金; 慷慨; 大方
参考例句:
  • They paid bounties for people to give up their weapons. 他们向放下武器的人发放赏金。
  • This foundation provided bounties of more than 5 million last year. 去年该基金会赠款达五百万元以上。
6 fully Gfuzd     
adv.完全地,全部地,彻底地;充分地
参考例句:
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
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