Sublethal concentrations of ichthyotoxic alga Prymnesium parvum affect rainbow trout susceptibility to viral haemorrhagic septicaemia virus

Nikolaj Gedsted Andersen, Ellen Lorenzen, Torsten Snogdal Boutrup, Per Juel Hansen, Niels Lorenzen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Ichthyotoxic algal blooms are normally considered a threat to maricultured fish only when blooms reach lethal cell concentrations. The degree to which sublethal algal concentrations challenge the health of the fish during blooms is practically unknown. In this study, we analysed whether sublethal concentrations of the ichthyotoxic alga Prymnesium parvum affect the susceptibility of rainbow trout Oncorhynchus mykiss to viral haemorrhagic septicaemia virus (VHSV). During exposure to sublethal algal concentrations, the fish increased production of mucus on their gills. When fish were exposed to the algae for 12 h prior to the addition of virus, a marginal decrease in the susceptibility to VHSV was observed compared to fish exposed to VHSV without algae. If virus and algae were added simultaneously, inclusion of the algae increased mortality by 50% compared to fish exposed to virus only, depending on the experimental setup. We concluded that depending on the local exposure conditions, sublethal concentrations of P. parvum could affect susceptibility of fish to infectious agents such as VHSV.
    Original languageEnglish
    JournalDiseases of Aquatic Organisms
    Volume117
    Issue number3
    Pages (from-to)187-195
    Number of pages9
    ISSN0177-5103
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Viral haemorrhagic septicaemia virus
    • Susceptibility
    • Harmful algal blooms
    • Fish Disease
    • Oncorhynchus mykiss
    • VHSV
    • Aquatic Science
    • Ecology, Evolution, Behavior and Systematics
    • Fish disease

    Fingerprint Dive into the research topics of 'Sublethal concentrations of ichthyotoxic alga Prymnesium parvum affect rainbow trout susceptibility to viral haemorrhagic septicaemia virus'. Together they form a unique fingerprint.

    Cite this