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U.S. Department of Health and Human Services

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Title:  Depletion of florfenicol amine, marker residue of florfenicol, from the edible fillet of tilapia (Oreochromis niloticus x O. niloticus and O. niloticus x O. aureus) following florfenicol administration in feed.
 
Authors:  Gaikowski MP, Mushtaq M, Cassidy P, Meinertz JR, Schleis SM, Sweeney D, Endris RG
 
Drug:  Florfenicol
 
Fish species:  Tilapia (hybrid)
 
Date:  2010
 
Sample:  muscle+skin
 
Ave Weight (gm):  488
 
Ave Water temp (°C):  27
 
Water:  Freshwater
 
Dosage:  15 mg/kg 12d
 
Route:  PO
 
Comments:  Fish were sacrificed by electrocution. Fish used in this study included females that were gender-reversed as fry using methyltestosterone. The dosing period was extended for an additional 2 d (12 d total) because Nile tilapia did not consume > 75% of the feed offered on the first two days. Mean minimum daily dose estimated at 12.3 (range:12.1-12.4) mg/kg BW/d (82% target daily dose).Mean florfenicol amine (FFA) concentration 1d post-dosing=0.78 ug/g, 2d-post-dosing=0.91 ug/g, 4d post-dosing=0.25 ug/g, 7d post-dosing=0.14 ug/g, 14d post-dosing=0.08 ug/g, 21d post-dosing = <0.08 ug/g, 28d post-dosing=<0.08 ug/g. FFA half life=2.32d. Significant differences in FFA concentrations were not observed at any time point between nile and hybrid tilapia.
 
Metabolites:  Florfenicol amine
 
Citation:  Aquaculture 301:1-6
 
Link:  doi:10.1016/j.aquaculture.2010.01.020  Opens a new window
 
Genus Species:  Oreochromis niloticus x O. aureus
 
Drug Class:  Antiobiotic-phenicol
 
t1/2-detail:  Metabolite halflife=2.32 d
 
Wt gm-detail:  488 +/- 76 g
 
Water temp (°C)-detail:  27+/- 2C (25.8-27.0 C)
 
Dosage-detail:  15 mg/kg 12d
 
Method:  HPLC-UV
 
Authors-red:  Gaikowski MP, Mushtaq M, Cassidy P, Meinertz JR, Schleis SM, Sweeney D., Endris RG
 
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