Rodlet cells in Murray cod, Maccullochella peelii peelii (Mitchell), affected with chronic ulcerative dermatopathy

Qifeng Ye, Steven Brooks, Gavin Butler, Jamin Forbes, George Giatas, Dean Gilligan, Taylor Hunt, Peter Kind, John Koehn, Mark LINTERMANS, Andy Moore, Charles R. Todd, Brenton Zampatti

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    Abstract

    We have previously identified an unknown cell type in the gills of Murray cod affected with chronic ulcerative dermatopathy (CUD), a condition that causes severe erosion of epidermis surrounding cephalic and lateral line sensory canals. The condition arises in aquaculture facilities that utilize groundwater, with the cause of the condition suggested to be an unknown contaminant(s). Light and transmission electron microscopy were used to characterize and quantify the unknown cells in CUD-affected Murray cod. The cells were identified as rodlet cells and were characterized by their oval or round shape, basally located nucleus, thick fibrillar capsule surrounding the cell, and multiple rodlet sacs containing a central electron-dense core within the cell. Rodlet cells were present in the gills, kidney and intestine of non-CUD-affected and CUD-affected Murray cod; however, differences in the numbers were observed between the groups of fish. A significantly greater number of rodlet cells were observed in the gills and collecting ducts of CUD-affected fish. This is the first report of rodlet cells in Murray cod, and we suggest that the increased rodlet cell numbers in CUD-affected Murray cod may be in response to unknown water contaminant(s) present in the groundwater that give rise to CUD.

    Original languageEnglish
    Title of host publicationStatus of key Australian fish stocks reports 2014
    EditorsM Flood, I Stobutzki, J Andrews, C Ashby, G Begg, R Fletcher, C Gardner, L Georgeson, S Hansen, K Hartmann, P Hone, P Horvat, L Maloney, B McDonald, A Moore, A Roelofs, K Sainsbury, T Saunders, T Smith, C Stewardson, J Stewart
    Place of PublicationCanberra, Australia
    PublisherAustralian Bureau of Agricultural and Resource Economics
    Pages219-228
    Number of pages10
    Volume37
    Edition3
    ISBN (Print)9780646932491
    DOIs
    Publication statusPublished - 2014

    Publication series

    NameJournal of Fish Diseases
    PublisherWiley-Blackwell
    ISSN (Print)0140-7775

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    Ye, Q., Brooks, S., Butler, G., Forbes, J., Giatas, G., Gilligan, D., Hunt, T., Kind, P., Koehn, J., LINTERMANS, M., Moore, A., Todd, C. R., & Zampatti, B. (2014). Rodlet cells in Murray cod, Maccullochella peelii peelii (Mitchell), affected with chronic ulcerative dermatopathy. In M. Flood, I. Stobutzki, J. Andrews, C. Ashby, G. Begg, R. Fletcher, C. Gardner, L. Georgeson, S. Hansen, K. Hartmann, P. Hone, P. Horvat, L. Maloney, B. McDonald, A. Moore, A. Roelofs, K. Sainsbury, T. Saunders, T. Smith, C. Stewardson, ... J. Stewart (Eds.), Status of key Australian fish stocks reports 2014 (3 ed., Vol. 37, pp. 219-228). (Journal of Fish Diseases). Australian Bureau of Agricultural and Resource Economics. https://doi.org/10.1111/jfd.12099