优乐娱乐

手机APP下载

您现在的位置: 首页 > 优乐娱乐场优乐娱乐 > 国外媒体资讯 > 密歇根新闻广播 > 正文

密歇根新闻广播(MP3+文本):五大湖出现太多海七鳃鳗

来源:可可优乐娱乐场 编辑:Alisa   VIP免费外教试听课 |  可可官方微信:ikekenet
  下载MP3到电脑  [F8键暂停/播放]   批量下载MP3到手机
加载中..
优乐娱乐参考文本(文本与音频不全一致,敬请谅解):
Lakes Superior and Erie have too many sea lampreys.
The invasive fish latch onto big fish like lake trout and salmon and drink their blood and body fluids. A single lamprey can kill up to 40 pounds of fish in its lifetime.
Marc Gaden is the communications director for the Great Lakes Fishery Commission. It's the commission’s job to keep the sea lamprey under control -- a job that costs about $21 million a year.
Gaden's group reported this month that lampreys are at historic lows in Lakes Michigan, Ontario and Huron.
But lamprey numbers have increased in Superior and Erie.
Gaden estimates that there are 80,000 lamprey too many in Lake Superior.
sea.jpg
"Why are they so high in Lake Superior? We don't know for sure, but we think that it could be a rebound; lampreys rebounding from a couple of very harsh winters," says Gaden.
"You might remember a few years ago we had some harsh winters downstate, and it certainly was the case in the northern parts of the Great Lakes region, as well, followed by a few milder winters, and maybe the lamprey took advantage of that and rebounded."
Gaden adds that there could also be more food in the lake, and therefore more fish for lamprey to prey upon.
And there could be new ways lampreys are getting into the lake.
"One area that we're very concerned about, and we're keeping a very close eye on, is the St. Louis River. It's a very large river at the western end of Lake Superior near the border between Minnesota and Wisconsin. It didn't produce lamprey, it's been polluted, and they've spent a lot of time cleaning up that river system. And it could be in the future a lamprey producer. We don't think it is now, but those are the kinds of things we keep our eye on," he says.
Gaden says in Lake Erie, lamprey levels are three times above the target level (there are about 9,000 too many lampreys). He says although the number of lampreys is on an overall downturn, there's been an uptick in recent years.
"The problem with Lake Erie is lamprey, we think, are coming from outside of the lake. So we've treated all the streams in Lake Erie that have lamprey in them - there's not many. We treat them again, and we treat them again, and we go out there, and we assess it, and sure enough: there aren't many lamprey left in those streams. But yet the numbers are very high in Lake Erie," he says.
The St. Clair River, Lake St. Clair, and the Detroit River are all suspected sources of the lampreys in Lake Erie.
But there could be more money heading toward the fight against sea lampreys. Gaden says the U.S. Senate is proposing about $7 million more in lamprey control.
He says after meeting with Republicans and Democrats from the Great Lakes congressional delegation, he is cautiously optimistic that the money will come through.
"There's a great amount of enthusiasm for the possibility here. I can tell you that our congressional delegation fights very hard for invasive species funds," he says.
重点单词   查看全部解释    
prey [prei]
想一想再看
n. 被掠食者,牺牲者
vi. 捕食,掠夺,使
 
border ['bɔ:də]
想一想再看
n. 边界,边境,边缘
vt. 与 ... 接
 
concerned [kən'sə:nd]
想一想再看
adj. 担忧的,关心的
 
harsh [hɑ:ʃ]
想一想再看
adj. 粗糙的,使人不舒服的,刺耳的,严厉的,大约的
 
director [di'rektə, dai'rektə]
想一想再看
n. 董事,经理,主管,指导者,导演
 
control [kən'trəul]
想一想再看
n. 克制,控制,管制,操作装置
vt. 控制
 
salmon ['sæmən]
想一想再看
n. 鲑,大马哈鱼,橙红色的
联想记忆
overall [əuvə'rɔ:l]
想一想再看
adj. 全部的,全体的,一切在内的
adv.
 
assess [ə'ses]
想一想再看
v. 估定,评定
 
advantage [əd'vɑ:ntidʒ]
想一想再看
n. 优势,有利条件
vt. 有利于
联想记忆
关键字: 密歇根新闻 广播
发布评论我来说2句

    优乐娱乐场学习专题

    可可优乐娱乐场官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的优乐娱乐场学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。
    优乐娱乐梦之城娱乐齐乐娱乐齐乐娱乐
    优乐娱乐齐乐娱乐优乐娱乐龙8娱乐老虎机手机版下载
    优乐娱乐梦之城娱乐齐乐娱乐梦之城娱乐
    优乐娱乐优乐娱乐场优乐手机版齐乐娱乐
    优乐娱乐齐乐娱乐优乐娱乐龙8娱乐老虎机手机版下载