NMFS NUMBER: 92-NWR-004
New Medications to Support U.S. Fish Farming
Elston, Ralph and Drum, Ann S.
Marine Fisheries Service, Northwest Region, 7600 Sand
Point Way, NE, BIN C15700, Bldg. 1, Seattle WA 98115.
PHONE: (206) 526-6117
The goal of
the project was to develop new field trial methods needed
to generate data for initiation of the drug registration
process specific to aquatic cultured fish. Currently,
there is a shortage of safe and effective antimicrobial
drugs to treat diseases in cultured fish and no validated
methods for clinical field trials. Difloxacin, a drug
used to treat furunculosis in Atlantic salmon, was used
to treat fish in both small scale and production size
net pens. The modified net pen showed no significant differences
in mortalities between medicated and control fish. However,
the mortality rates for rated fish could not be fully
assessed because severe outbreaks of furunculosis did
not occur during the study period. Operational requirements
were developed for use of the small net pen and recommendations
were made for further refinements.