●Grass carp:The first of the modern carp to invade America, grass carp were brought to Arkansas and Alabama in 1963 from China and Malaysia. They were introduced in the hope that they’d control pond weeds and other unwanted vegetation at fish farms.They did,and for years their introduction...
obvious one was the deliberate introduction ofEuropean carp(欧洲鲤鱼) to the River Murray. The carp were introduced to eat the weeds growing in the river. Now they have taken over much of the river’s ecosystem and severely reduced the number of native fish. ...
They were introduced in the hope that they’d control pond weeds and other unwanted vegetation at fish farms.They did,and for years their introduction was considered a success. But as more and more got loose and wound up in the...