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The trematode parasite Transversotrema patialense (Soparkar, 1924) (Digenea: Transversotrematidae) is reported from New Zealand for the first time. The parasite was first observed serendipitously within water surrounding the non-indigenous thiarid snail Melanoides tuberculata, a known intermediate host, bought from an online Auckland aquarium trade supplier in April 2016. In 2019, we systematically surveyed M. tuberculata from three online suppliers, a home and university laboratory aquaria, and from the only known New Zealand “wild” population, to determine its prevalence. The parasite was found to be present only from snails bought from a single Christchurch supplier. The establishment of T. patialense in New Zealand’s natural waters will be dependent on the presence of M. tuberculata, and appropriate fish hosts, and will therefore likely be limited to geothermally warmed waters. Release of infected snails from aquaria would be required for the establishment of the parasite in the “wild” population, and in other suitable habitats. Further research is necessary to quantify the threat that T. patialense poses to native fish in New Zealand, though these are not typically found in geothermally heated waters. The greatest risk of the parasite currently is to the health of captive tropical aquarium fish.

bioinvasions records

First record of the parasite Transversotrema patialense (Soparkar, 1924) within New Zealand, and its prevalence in Melanoides tuberculata (Müller, 1774) among captive and “wild” populations