Parasites of the invasive tilapia Oreochromis mossambicus: evidence for co-introduction

Wilson, Julian R., Saunders, Richard J., and Hutson, Kate S. (2019) Parasites of the invasive tilapia Oreochromis mossambicus: evidence for co-introduction. Aquatic Invasions, 14 (2). pp. 332-349.

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Reduced parasite species diversity and infection intensity on invasive populations can facilitate establishment and spread of invasive species. We investigated the parasite diversity of invasive populations of tilapia Oreochromis mossambicus from published literature and necropsies conducted on 72 fish captured in the Ross River, north Queensland, Australia. The parasite diversity of invasive O. mossambicus from 13 countries was compared to published reports on endemic populations in African river systems and tributaries to determine parasite species that had likely been co-introduced. In total, four parasite species were shared between native and invasive tilapia. We propose that these parasites (three monogeneans, Cichlidogyrus tilapiae Paperna, 1960, Cichlidogyrus sclerosus Paperna and Thurston, 1969, Cichlidogyrus halli (Price and Kirk, 1967) and one trichodinid Trichodina heterodentata Duncan, 1977) have likely been co-introduced with invasive Oreochromis mossambicus populations. Invasive Australian O. mossambicus had substantially reduced parasite diversity (five species) compared to cumulative parasite species diversity documented from the native region (23 species). Australian O. mossambicus were infected by two co-introduced parasites and three additional parasite species that have not been recorded previously on this species in Africa indicating possible parasite "spillback" from Australian natives or alternatively, acquisition from other introduced fauna. The substantially reduced parasite diversity on invasive Australian O. mossambicus could contribute to the ability of this species to become a serious fish pest.

Item ID: 60363
Item Type: Article (Research - C1)
ISSN: 1818-5487
Keywords: co-invasive, Cichlidae, aquatic animal health, enemy release hypothesis, spillback, ornamental fish trade
Date Deposited: 18 Sep 2019 03:53
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300503 Fish pests and diseases @ 50%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310304 Freshwater ecology @ 20%
31 BIOLOGICAL SCIENCES > 3107 Microbiology > 310702 Infectious agents @ 30%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960406 Control of Pests, Diseases and Exotic Species in Fresh, Ground and Surface Water Environments @ 100%
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