Effects of monensin dose and treatment time on ...
|Title||Effects of monensin dose and treatment time on xenoma reduction in microsporidial gill disease in rainbow trout, Oncorhynchus mykiss (Walbaum)|
|Author(s)||J. A. Becker, David J. Speare, J. Daley, P. Dick|
|Journal||Journal of Fish Diseases|
|Abstract||The objectives of the study were (1) to determine an acceptable dose of dietary monensin against microsporidial gill disease (MGD) of salmon caused by Loma salmonae and (2) to determine the life stage of L. salmonae at which the action of monensin was most effective at reducing clinical disease. Rainbow trout (RBT) were fed monensin diets at concentrations of 0, 10, 100, 1000 and 5000 ppm starting 1 week before per os exposure to L. salmonae infected gill material. Lethal sampling occurred at weeks 6, 7, 8 and 9 post-exposure (PE). The acceptable dose of dietary monensin was determined to be 1000 ppm because it was the lowest concentration that produced a significant and constant reduction in xenoma formation. RBT were fed monensin at 1000 ppm beginning at 0, 1, 2 and 3 weeks before exposure and at 1, 2 and 3 weeks after exposure and continuing until week 9 PE. Fish in which treatment was initiated at the time of exposure or 1 week before, showed the greatest reduction in xenoma production when compared with the untreated RBT..|
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