Host fishes for the glochidia of Westralunio carteri Iredale (Bivalvia: Hyriidae)
Klunzinger, M., Beatty, S., Morgan, D., Thomson, G. and Lymbery, A. (2012) Host fishes for the glochidia of Westralunio carteri Iredale (Bivalvia: Hyriidae). In: Molluscs 2012: Meeting of the Malacological Society of Australasia, 3 - 6 December, Melbourne, Australia.
Glochidia (parasitic larvae) of freshwater mussels generally require a fish as a host Westralunio carteri Iredale 1934(Bivalvia: Hyriidae), the only freshwater mussel from south-western Australia (SWA), Is listed as a Priority 4 (P4) species by the Western Australian Government, was listed as Vulnerable but recently changed to Least Concern by the IUCN. Glochidia were found on three alien (Eastern Gambusia (Gambusio holbrooki (Girard, 1859)), One-spot livebearer (Phalloceros caudimaculatus (Hensel, 1868)) and Goldfish (Carassius auratus Linnaeus, 1758))) and seven native species of fish (Swan River goby (Pseudogobius olorum (Sauvage, 1880)), South-western goby (Afurcagobius suppositus (Sauvage, 1880)), Western minnow (Galaxias occidentalis Ogilby, 1899), Western pygmy perch (Nonnoperca vittara (Castelnau, 1873), Nlghtfish (Bostockia poroso Castelnau, 1873, Western hardyhead (Leptatherina wallacei (Prince, lvantsoff & Potter, 1982) and Freshwater cobbler (Tandanus bostocki Whitley, 1944)) from 18 sites in SWA. On alien fishes, glochidia prevalence ranged from 0.0 to 41.0% and mean Intensity (number of glochidia per infested fish) from 1.0 to 6.0, while on native fishes prevalence was 9.2—90.5% and intensity was 2.3—7.1. Glochidia infestation was greatest on benthic fishes, which may be a consequence of greater encounter rates, but other factors, including host size, probably also influence glochidia prevalence and intensity. Glochidia were generally restricted to fins, but seldom found on gills or the body surface. In a laboratory exposure trial, four native (Swan River goby, South-western goby, Western pygmy perch and Freshwater cobbler) and one alien fish species (Eastern Gambusia) were found to be competent hosts for their ability to produce juvenile W. carteri, but two alien fish species (Goldfish and Pearl cichlid (Geophagus brasiliensis (Quoy & Gaimard, 1824))) were not. The inability of some alien fishes to produce juvenile W. carteri could potentially reduce recruitment success in degraded areas dominated by alien fishes such as Goldfish.
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|Murdoch Affiliation:||Fish Health Unit|
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