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Relationship between southern bluefin tuna, Thunnus maccoyii, melanomacrophage centres and Cardicola spp. (Trematoda: Aporocotylidae) infection

Citation

Widdicombe, M and Power, C and Van Gelderen, R and Nowak, BF and Bott, NJ, Relationship between southern bluefin tuna, Thunnus maccoyii, melanomacrophage centres and Cardicola spp. (Trematoda: Aporocotylidae) infection, Fish and Shellfish Immunology, 106 pp. 859-865. ISSN 1050-4648 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Elsevier Ltd.

DOI: doi:10.1016/j.fsi.2020.09.004

Abstract

Southern Bluefin Tuna (SBT), Thunnus maccoyii, is ranched off Port Lincoln, South Australia and is Australia's second largest economic finfish aquaculture industry. The biggest threats to SBT health identified by the industry are the blood flukes Cardicola forsteri and C. orientalis (Trematoda: Aporocotylidae). Melanomacrophage centres (MMCs) are aggregations of pigmented macrophage like cells present in spleen, kidney and liver of teleost fish. The aim of this study was to quantify MMCs in SBT anterior kidney, liver and spleen to investigate changes in relation to Cardicola spp. Infection. Samples were collected at the end of ranching from pontoons where SBT were treated with PZQ and pontoons with untreated SBT. SBT MMC percentage of surface area cover was highest in SBT spleen and lowest in the liver. Significant positive correlations were identified between SBT MMC area and SBT size in all three organs (p < 0.05). MMC area and parasite infection showed significant positive correlations in the kidney and spleen for Cardicola spp. gill egg counts, and in the kidney for C. forsteri DNA from SBT hearts and gills (p < 0.05). MMCs area increased with increased intensity of Cardicola spp. Infection and MMCs have the potential to be used as an indicator to assess health effects that Cardicola spp. have on SBT.

Item Details

Item Type:Refereed Article
Keywords:Thunnus maccoyii, southern bluefin tuna, Cardicola spp., blood fluke, melanomacrophage, histology, aquaculture, image analysis
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture tuna
UTAS Author:Nowak, BF (Professor Barbara Nowak)
ID Code:140955
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Fisheries and Aquaculture
Deposited On:2020-09-16
Last Modified:2021-02-15
Downloads:0

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