The National Nonindigenous Aquatic Species Program

http://pubs.usgs.gov/fs/2012/3100/

Concerted effort to monitor, analyze, and record sightings of non-native (introduced) aquatic species throughout the United States. Explains characteristics of the database that is compiled by this program.

by Pawlitz, Rachel J. and David, Kayla D.

U.S. Geological Survey Fact Sheet 2012-3100

This publication is available only as a PDF document.