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Susceptibility of selected freshwater fish species to a UK Lactococcus garvieae isolate
Author(s) -
Algöet M,
Bayley A E,
Roberts E G,
Feist S W,
Wheeler R W,
VernerJeffreys D W
Publication year - 2009
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.2009.01058.x
Subject(s) - biology , rainbow trout , trout , virulence , veterinary medicine , microbiology and biotechnology , fish farming , fish <actinopterygii> , fishery , aquaculture , medicine , biochemistry , gene
Gram‐positive cocci recovered from diseased rainbow trout from a farm in England were characterized by different methods, including pulsed field gel electrophoresis, as virulent Lactococcus garvieae serogroup 2 (pulsotype A1). Groups of rainbow trout were kept at a range of temperatures and injected intraperitoneally (i.p.) with one of the UK isolates, L. garvieae 00021. The 18 °C and 16 °C groups showed 67% and 28% mortality, respectively, by day 27 post‐injection. Fish kept at 14 °C or lower were less susceptible (≤3% mortality). Raising the temperature of all groups to 18 °C at day 27 post‐injection did not result in recurrence of the disease, even though viable bacteria were recovered from all groups 42 days later. Grayling were highly susceptible, with 65% mortalities when challenged with 200 colony forming unit fish −1 by i.p. injection and 37% mortalities when exposed to effluent water from tanks containing affected rainbow trout. Other fish species tested, Atlantic salmon, brown trout and seven cyprinid species, were less susceptible. Viable L. garvieae was isolated from the internal organs of all species tested at the end of the trials, suggesting that they may pose a threat as possible carriers to susceptible farmed and wild fish.