Effects of short- and long-term glucan feeding of rainbow trout (Salmonidae) on the susceptibility to Ichthyophthirius multifiliis infections
2010
Lauridsen, J.H. | Buchmann, K.,University of Copenhagen, Faculty of Life Sciences, Frederiksberg C (Denmark). Dept. of Veterinary Disease Biology
The immuno-modulating effects on rainbow trout, Oncorhynchus mykiss (Walbaum, 1792) of short- and long-term feeding using dry feed with inclusion of beta-glucan (0.2%) have therefore been evaluated. The immune reactivity was assessed by measuring susceptibility to Ichthyophthirius multifiliis infections and plasma lysozyme in the host, factors which are considered innate response parameters. Rainbow trout were fed (control feed or glucan-containing feed) for 14 or 35 days before challenge (exposure to infective I. multifiliis theronts) and the resulting infection (number of trophonts in the skin) was recorded on day 11 post-exposure to theronts. All fish obtained infection following parasite exposure but glucan-fed fish showed a lower infection at day 46 compared to fish fed control-feed
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