久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Environment

Fish farms turn murky waters clear in Liaoning

Province winning battle against algal blooms in its lakes and reservoirs with solution that also generates commercial revenue

By LI LEI in Beijing and WU YONG in Shenyang | China Daily | Updated: 2024-03-21 09:58
Share
Share - WeChat

Editor's Note: As protection of the planet's flora, fauna and resources becomes increasingly important, China Daily is publishing a series of stories to illustrate the country's commitment to safeguarding the natural world.

A panoramic view of the Guanyinge Reservoir in Benxi, Liaoning province, in October. HUANG JINKUN/FOR CHINA DAILY

The once murky waters found in lakes and reservoirs across Northeast China's Liaoning province are being made clear again thanks to the help of a partner found in Mother Nature — fish.

The State-owned Liaoning Water Resource Management Group in 2016 began implementing a plan introduced by the then-ministry of agriculture to establish fish farms in algae-plagued water bodies to improve water quality and provide a secondary source of revenue.

Algal blooms emerge as nitrogen and phosphorus build up in lakes, reservoirs and other slow-moving waters due to agricultural runoff and contamination from untreated urban sewage.

The blooms endanger the ecosystem of freshwater lakes and can cause taste and odor problems in waters used for drinking.

The water management group, which operates 16 reservoirs across Liaoning and supplies nearly 70 percent of the province's water, has long wrestled with algae.

By introducing fish into water bodies, the water resource group is able to control algal blooms, clean up the water and then re-catch the fish to sell on the market once they've reached maturity, bringing in revenue and bolstering the nation's food security.

In recent years, provinces such as Yunnan, Anhui and Shandong, where freshwater lakes are abundant, have also rolled out similar programs.

However, these programs' custodians have warned the process is not as simple as it seems.

"Not all fish can thrive in reservoirs," said Guan Wankai, who oversees the group's operations at Guanyinge Reservoir in Benxi, southeast Liaoning.

Guan said to make the program work, the group has looked to filter-feeding fish including carp and types of catfish, that guzzle particles suspended in the water.

He said the fish in Guanyinge Reservoir are mostly silver and bighead carp.

Citing research data, the official said harvesting a kilogram of carp is equivalent to removing about 20 grams of nitrogen, 1.5 grams of phosphorus and 118 grams of carbon from the water. When calculated by the biomass of algae, 40 kg are eliminated from the water with every kilogram of fish caught.

In a written response to China Daily's request for comment, the group said it had released 7,945 metric tons of carp and other species across Liaoning by last year, and the harvest amounted to 28,100 tons.

In 2023, 4,600 tons of fish were caught, with the group raking in an additional 71 million yuan ($9.86 million), it said.

1 2 3 Next   >>|
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 国产一级爱c片免费播放 | 中文字幕日韩精品亚洲七区 | 欧美日韩国产综合一区二区三区 | 欧美日比视频 | 成人123| 欧美成人性性 | 最新福利片v国产片 | 国产日韩美国成人 | 999国内精品永久免费视频 | 精品韩国主播福利视频在线观看一 | 神马午夜视频 | 欧美a级毛片免费播敢 | 国产精品7m凸凹视频分类大全 | 久草网视频在线 | 亚洲精品自产拍在线观看 | 午夜在线亚洲男人午在线 | 视频偷拍一级视频在线观看 | 国产精品亚洲玖玖玖在线靠爱 | 花蝴蝶在线 | 亚洲天堂.com | 国产欧美日韩精品在线 | 欧美性妇| 国产亚洲综合成人91精品 | 欧美色成人tv在线播放 | 精品欧美一区二区在线观看 | 日本69色视频在线观看 | 中国美女一级看片 | 一级毛片无毒不卡直接观看 | 成人在线综合 | 国产免费午夜a无码v视频 | 伊人色综合7777 | 国产在线精品观看一区 | 成人合成mv福利视频网站 | 久久99亚洲精品久久久久网站 | 欧美亚洲日本韩国一级毛片 | 神马午夜视频 | 免费特黄级夫费生活片 | 国产人做人爱免费视频 | 美女视频网站色 | 日韩欧美一区二区三区不卡视频 | 国产一国产一级毛片视频在线 |