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Guide to New Zealand's freshwater invertebrates
The ampullariid snails are not native to New Zealand, but they have been introduced through the aquarium and aquatic plant trades. They have thin, rounded shells and there is an operculum (protective shield) that covers the aperture (shell opening) when the animal withdraws. Adult shells are rounded and can be several centimeters across, hence the common name “apple snails”. The aperture is on the right when facing toward you and when the spire points upwards (see lower photo of a juvenile).
Ampullariids are common in many ornamental ponds and aquaria, and occasionally they are found in streams and rivers.
Like most snails they are grazers, scraping biofilms from submerged surfaces.
The presence of ampullariids is more likely to reflect past introductions of pond plants than any aspects of water quality. They have not been assigned any tolerance values.