国产丝袜在线精品丝袜|在线A毛片免费视频观|日韩精品久久久一区二区|亚洲成在人网站天堂直播|99在线精品66视频无码|亚洲欧美不卡视频在线播放|国产精品久久久久久免费一级|久久精品国产亚洲AV香蕉软件

World's fishing boats double, but catch capacity dwindles: study

Source: Xinhua| 2019-05-28 04:10:18|Editor: Mu Xuequan
Video PlayerClose

WASHINGTON, May 27 (Xinhua) -- Australian scientists found that the world's fishing vessels doubled in size over the 65 years to 2015 but their catch capacity fell more than 80 percent during that period.

The study published on Monday in the journal Proceedings of the National Academy of Sciences showed that the global fishing fleet grew from 1.7 million vessels in 1950 to 3.7 million in 2015.

However, those vessels take only about 20 percent of the catch per unit of effort (CPUE) that the 1950s fishing boats achieved.

Scientists from the University of Tasmania who led the study said that it was a clear reflection of growing pressure on marine resources and a fall in the abundance of fish.

CPUE reflects how many fish are caught for the amount of effort expended, such as during a day's fishing, according to the researchers.

Also, most of the vessels newly built for fishing are motorized ones, instead of the unpowered vessels that once characterized Asian and African fishing fleets.

"In recent years a sharp drop in CPUE in Southeast Asia, Latin America and the Southern Mediterranean indicates their fisheries expanded at a much faster rate than fish stocks could support," said Yannick Rousseau, a marine researcher from the University of Tasmania.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011105091380948701
绵竹市| 抚州市| 玉环县| 宜兰市| 榆社县| 荥经县| 屯门区| 西盟| 延庆县| 华容县| 晋江市| 天门市| 措美县| 维西| 新宁县| 宝清县| 东乡| 青铜峡市| 库伦旗| 新绛县| 枞阳县| 泸水县| 浦东新区| 陇西县| 淳化县| 呼图壁县| 彭水| 安岳县| 博客| 兴义市| 平原县| 岑巩县| 宜兰县| 镇宁| 凤山县| 巴塘县| 顺昌县| 沂源县| 宣威市| 南木林县| 通辽市|