男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

Make me your Homepage
left corner left corner
China Daily Website

Fish ecosystem on Yangtze 'on verge of collapse'

Updated: 2013-08-16 01:42
By Yang Yao ( China Daily)

Fish ecosystem on Yangtze 'on verge of collapse'

Landscape changes since 2005 along the banks of the Chishui River, a tributary of the Yangtze River, suggest the grave effects of human activity on the ecosystem of China’s longest river. [PHOTO BY WANG LEI / FOR CHINA DAILY]

Human activity along the upper reaches of the Yangtze River - such as building hydropower stations and excessive fishing - has pushed its aquatic ecosystem to the verge of collapse, a report released on Thursday warns.

Researchers suggested starting a fishing ban along the entire river and enacting a national law to protect the "mother river" of China, as its fishery resources are experiencing a severe recession.

The number of fish in four major species has shrunk from more than 30 billion in the 1950s to less than 100 million, and the number of breeds has been reduced from 143 to 17, according to the report released by the Yangtze River Fishery Resources Committee under the Ministry of Agriculture and the World Wide Fund for Nature.

The report is based on a 12-day scientific expedition in five provincial-level regions in June, in which 32 researchers from government agencies and NGOs participated.

It was the first expedition of its kind to study the upper reaches of the Yangtze River regarding wetlands, aquatic diversity and water environment, according to the WWF.

Besides the sharp decrease in the number of fish, some species, such as the finless porpoise, have already become extinct, said Zhao Yimin, head of the Yangtze River Fishery Resources Committee.

The plight along the river is not catching much public attention "as people can buy fresh fish from a wet market every day. They don't realize how serious the situation is", Zhao said.

"The source species are reducing, leading to unsustainable development of aquaculture and an increasingly fragile ecosystem."

Zhao said China's fishery resources will be drained soon if no immediate action is taken.

The report cited over-exploitation of hydropower and lax law enforcement as major reasons behind the dire situation.

On the Jinsha River, 25 hydropower plants are being, or will be built 100 km apart along the 2,308 km tributary of the Yangtze, according to the country's energy development plan.

Once completed, the plants will have power-generating capacity equivalent to four Three Gorges Dam projects.

"It will cut the river into sections, and completely change the aquatic environment, bringing a devastating impact to species and water quality," Zhao said.

According to environmental laws, a power plant has to pass an environmental impact assessment before construction starts. However, a majority of the projects go ahead without any assessment, Zhao said.

Previous Page 1 2 Next Page

8.03K
 
...
Hot Topics
A sailor from British Royal Navy destroyer HMS Daring tries to catch a mooring line to dock in the north side of the bund at Huangpu River in Shanghai December 10, 2013.
...
...
主站蜘蛛池模板: 赤水市| 商丘市| 周宁县| 大足县| 平昌县| 重庆市| 沛县| 紫金县| 治多县| 新野县| 南召县| 陆丰市| 息烽县| 九龙城区| 微博| 全南县| 陆河县| 长汀县| 永修县| 武义县| 肇源县| 赫章县| 永新县| 肇庆市| 横山县| 天祝| 花莲县| 兴仁县| 鹿邑县| 封丘县| 布拖县| 湖南省| 淮安市| 夏河县| 信宜市| 寻乌县| 定州市| 昭平县| 淮安市| 崇阳县| 喀喇沁旗|