Fig 1. Agarose gel showing PCR amplification products obtained with the species primers’ set for 16S rRNA gene from serial dilutions of Potamopyrgus antipodarum DNA (43μg/ml): 1 (no dilution), 1:5, 1:10, 1:25, 1:50, 1:100, 1:500, 1:1000, 1:5000, 1:10000, 1:50000, 1:100000 and a negative control.