The salmon louse Lepeophtheirus salmonis (Caligidae) as a vector of Aeromonas salmonicida ...

• Main Author: Novak, Colin William
• Format: Text
• Language: English
• Published: University of British Columbia 2013
• Subjects: Atlantic salmon; Salmo salar
• Online Access: https://dx.doi.org/10.14288/1.0074040; https://doi.library.ubc.ca/10.14288/1.0074040

The sea louse, Lepeophtheirus salmonis, has been hypothesized to be a vector of fish pathogens and previous studies have isolated viral and bacterial pathogens from L. salmonis parasitizing farmed salmon. To examine the potential transmission of A. salmonicida by preadult and adult L. salmonis via parasitism of Atlantic salmon (Salmo salar), an in vivo bacteria-parasite challenge model was tested. Two pathogen challenge trials were performed, in which sea lice from donor (Aeromonas salmonicida-injected) fish were allocated among recipient fish for 14 days. Three hypotheses were examined: (i.) L. salmonis can acquire A. salmonicida from donor fish via parasitism; (ii.) A. salmonicida-exposed sea lice can transmit the pathogen to recipient Atlantic salmon via parasitism and (iii.) L. salmonis and A. salmonicida infections can cause synergistic effects on host fish. Sea lice acquired A. salmonicida externally (Trial 1 and 2, 100%) and internally (Trial 1, 100%) from parasitizing donor fish. Trial 1 (~44g fish) ...