Seasonality of Ectoparasites and Pathology of three Species of Didymozoids (Trematoda, Digenea) of Slimy Mackerel, 'Scomber Australasicus' (Teleostei, Scombridae)

Abstract

The ectoparasitic fauna of slimy mackerel, 'Scomber australasicus', from Eden, New South Wales Australia was examined in 428 fish collected in 12 samples during the period from November 1988 to June 1992. The aim was to study the species composition, microhabitats, seasonal variations and host responses. The host responses were studied in detail in three didymozoid parasites using scanning and transmission electron microscopy in addition to observations made under the light microscope.