The Scientist Staff | Nov 24, 1996 | 7 min read
STICKING POINT: Zebra mussels, here attached to a crayfish, can be real pests. Late last month President Bill Clinton signed the National Invasive Species Act, which will provide additional funds to combat a growing ecological and economic problem. Non-native freshwater and marine plants and animals from as far away as Asia are carried to North American estuaries like San Francisco Bay-where they sometimes gain a troublesome toehold-in ship ballast water. The act authorizes an average of $22