Rearing unit-level factors associated with bacterial gill disease treatment in two Ontario, Canada government salmonid hatcheries
- Good, Christopher M.
- Thorburn, Margaret A.
- Ribble, Carl S.
- Stevenson, Roselynn M.W.
DOIAbstract
AbstractEarly-rearing salmonids in Ontario Ministry of Natural Resources (OMNR) fish hatcheries have been consistently affected by bacterial gill disease (BGD) (causative agent: Flavobacterium branchiophilum) for many years. Separate retrospective epidemiological investigations of BGD treatments at two OMNR fish hatcheries (Hatcheries A and B) for the 1999 production year were conducted using on-site hatchery records. Both investigations were carried out at the rearing unit-level, with early-rearing (<9 months of age) “tank-lot” as the unit of analysis to identify unique fish populations over time. Multivariable repeated measures logistic regression models were created for both hatchery datasets, controlling for lot-level and species effect...
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