刚准备动身，还好查了一下PA，居然还没有宣布鲤鱼为入侵物种！ http://www.fishandboat.com/Fish/PennsylvaniaFishes/Pages/Carp.aspx
还振振有词说这是伦家故意放养的。
Native to Asia, and spread throughout Europe by the Romans, carp were first
stocked as a food fish in the U.S. in the late 1870s by the newly created
Fish Commission. They were then spread by state governments to most U.S.
watersheds in an effort to take pressure away from native fishes.
好吧，老汉就静静的看你们装逼……
