Background: Nematodes of the family Anisakidae are parasites of marine organisms such as fish
and sea mammals pose a threat to humans and cause the disease anisakiasis. In Australia
little has been done to evaluate the risk of exposure for consumers of infected fish to these
parasites. The aim of the present study is to partially address this gap by a small-scale
survey of five local fish species from southern Australia destined for consumption. Methods:
Fish were collected and examined for intestinal worms including anisakids. The parasite larvae
collected were fixed and identified both by morphological morphometric analysis and by
molecular investigation of the PCR-amplified internal transcribed spacer region of nuclear
ribosomal DNA. Both datasets were combined and interpreted together with other biological data.
Results: Infection rates of anisakid nematodes in the respective fish species ranged between 20
% and 100 %. Larval stages of seven anisakid species of three different genera namely Anisakis
Contracaecum and Hysterothylacium were identified. Some species discovered represent
molecularly uncharacterized specimens and await unequivocal identification. Conclusion: The
data show that Anisakis and related species are prevalent in southern Australia in some fish
hosts in large numbers. Further research will provide a better understanding of the parasite
and other factors linked to anisakiasis.
