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Parasites of the albacore (Thunnus alalunga) as possible stock markers

Jones, J.B.ORCID: 0000-0002-0773-2007 (1985) Parasites of the albacore (Thunnus alalunga) as possible stock markers. In: South Pacific Commission 17th Regional Technical Meeting on Fisheries, 5 - 9 August 1985, Noumea, New Caledonia



Parasites are being collected from albacore caught in New Zealand waters. The study has already provided evidence that albacore caught by trolling on the east coast of the North Island have originated in the tropics as has been assumed in past publications. It is possible that this study will also provide information on the movements of albacore around the New Zealand coastline.

Parasites identified thus far include: an unidentified sporozoan from the liver; digenean trematodes Platocystis alalongae, Hirudinella sp., plus five species of Didymozoidae) from the skin, buccal cavity, stomach and intestine; cestodes (Tentacularia coryphaenae and one other species) from the body cavity and digestive diverticula; two species of intestinal nematodes; and the copepod Pseudocycnus appendiculatus from the gills. All of these species are semi-permanent and several have proved useful as markers in other studies. Only P. appendiculatus has previously been recorded from albacore caught in New Zealand waters.

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