Abstract
Abstract Results of a study undertaken between 1976 and 1983 suggest several conditions are necessary for Cercaria longicauda to cause swimmers’ itch in Lake Wanaka. These are water temperatures in excess of 13°C, the presence of beds of the water plant Isoetes alpinus with sediment on the leaves, and the presence of the two hosts: the water snail Lymnaea tomentosa, and the New Zealand scaup Aythya novaeseelandia. The release of the dermatitis causing cercariae is spasmodic and restricted to summer. Cercariae were released only from snails more than 3 mm long.
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