A parasite survey of farmed Southern bluefin tuna, <i>Thunnus maccoyii</i> (Castelnau)

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<jats:title>Abstract</jats:title><jats:p>Farmed Southern bluefin tuna (SBT) were examined for parasites. Samples of harvest fish, mortalities and some fish showing clinical signs of disease were investigated. Targeted screening was conducted for a scuticociliate, <jats:italic>Uronema nigricans</jats:italic>, the myxosporean <jats:italic>Kudoa</jats:italic> sp. and a sanguinicolid digenean, <jats:italic>Cardicola forsteri</jats:italic>. General parasitological investigation revealed a diverse parasite community of didymozoid digeneans, two species of copepods, a polyopisthocotylean monogenean and larval cestodes. Targeted screening for <jats:italic>U. nigricans</jats:italic> exposed a low prevalence, most probably due to a lack of sensitivity in the test method. Few of the parasites examined pose a risk to the health of farmed SBT.</jats:p>

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