综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

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

 
...
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.
...
...
买车| 深泽县| 监利县| 龙江县| 涟水县| 合川市| 霞浦县| 乌审旗| 牙克石市| 武安市| 潜山县| 富裕县| 玉门市| 铜鼓县| 寻甸| 漳平市| 普兰店市| 儋州市| 肃宁县| 洪江市| 宁强县| 玉龙| 彭泽县| 宾川县| 鲁山县| 岚皋县| 苍溪县| 靖边县| 吉林省| 青阳县| 两当县| 邢台县| 岐山县| 扎囊县| 普洱| 莎车县| 铁岭县| 琼海市| 红原县| 六安市| 永登县|