在埃及灌排渠道中,杂草丛生已成为严重问题,特别是在修建阿斯旺高坝以后,渠水变清,给杂草滋生提供了有利条件。从1981年开始,埃及渠道养护研究所就与荷兰的欧洲咨询公司合作,共同研究用养殖草鱼来控制渠道杂草的问题。该研究所修建了一座总容量为50万尾标准尺寸鱼苗的大型孵化库,为全国近十年来的试验提供鱼苗。为了保护环境,1990的8月,埃及公共工程和水资源部宣布禁止使用化学药剂杀灭渠道中的杂草,这使用生物方法控 Weeds have become a serious problem in Egypt’s irrigation and drainage channels, especially after the construction of Aswan High Dam, which has cleared the water and provided favorable conditions for the breeding of weeds. Since 1981, the Egyptian Institute for Channel Conservation has been working with the European consultancy in the Netherlands to study the problem of channel weed control by using cultured grass carp. The institute constructed a large hatchery with a total capacity of 500,000 fish fry in standard size to provide fry for the nation’s testing in the past decade. In order to protect the environment, in August 1990, the Egyptian Ministry of Public Works and Water announced the ban on the use of chemicals to kill weeds in the channels, using biological methods