Bighead and silver carp - both native to Asia - have been migrating toward the lakes since escaping from Deep South fish ponds and sewage treatment plants in the 1970s.

原产于亚洲的大头鲤鱼和银鲤鱼，20世纪70年代从南方鱼塘和污水处理厂逃逸以来，已经向五大湖扩散。

youdao

The first involves two kinds of Asian carp, bighead and silver.

第一个案例涉及两种亚洲鲤鱼：大头鱼和银色鲤鱼。

youdao

The first involves 2 kinds of Asian carp, bighead and silver.

第一个案例是关于2种亚洲鲤鱼，头大，银色的鱼身。

youdao

The first involves two kinds of Asian carp, bighead and silver.

VOA: special.2009.12.15

There are two types of Asian Carp in the Illinois River - bighead and silver.

VOA: standard.2010.07.20

Of particular concern are silver and bighead carp, which gorge on plankton microscopic plants and animals that virtually all fish eat at some point.

WSJ: Report: Asian carp may have reached Great Lakes

He defended Illinois' efforts to block the advance of silver and bighead carp toward the lakes by hiring commercial fishermen and operating an electric barrier, but acknowledged more needs to be done.

NPR: Gov. Quinn Open To Great Lakes-Mississippi Split

Bighead and silver carp imported from Asia decades ago have infested the Mississippi River and many of its tributaries.

WSJ: Study: Asian carp unlikely to stow away in barges