Prophylactic effect of levamisole on rainbow trout (Oncorhynchus mykiss) against Yersinia ruckeri

Abstract

Ispir U. 2009. Prophylactic effect of levamisole on rainbow trout (Oncorhynchus mykiss) against Yersinia ruckeri. Pesquisa Veterinaria Brasileira 29(9): 700-702. Faculty of Agriculture, Department of Fisheries, Bingol University, 23119 Bingol, Turkey. E-mail: uispir@yahoo.com Alteration in the relative percentage of survival (RPS) rate of rainbow trout (Oncorhynchus mykiss) exposed to 5, 10 and 25 mu g ml(-1) levamisole for 2 h against Yersinia ruckeri was investigated. The average weight of the 120 fish used in this study was 6.3g. Upon challenge with a virulent strain, the relative survival percentage of respectively 83.3\%, 86.7\% and 76.6\% was recorded. The results suggest that the application of levamisole in fish farms could increase resistance to infection of fish and offer economic benefits.