The followings 2 contacts offer information and advice on Gambusia affinis:
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1. Fuller, Pam (USGS/BRD Nonindigenous Aquatic Species Program)
Address: Center for Aquatic Resources Studies 7920 NW 71st Street Gainesville, FL 32653
Phone: (352) 378-8181 x312
2. McDowall, R.M (National Institute of Water & Atmospheric Research Ltd.)
Address: "National Institute of Water & Atmospheric Research Ltd.
Address: PO Box 8602, Christchurch"