Abstract
The effects of the following six treatments against Loma salmonae, a microÍsporidian gill pathogen, were examined in rainbow trout: fumagillin (high dose), pyrimethamine + sulphaquinoxaline, albendazole, amprolium, fumagillin (low dose), and metronidazole. The fish were infected by mouth and the treatments were administered at intervals for a period of several weeks. The results were assessed on the basis of (1) delay in the formation of xenomas, and (2) the number of xenomas per gill arch. The first five treatments, in descending order of efficacy, delayed the formation of xenomas (P<0·01), but metronidazole had no such effect. Fumagillin (high or low dose) and albendazole both reduced the number of xenomas present 10 weeks after infection (P<0·01), but the other three treatments did not do so. From these results, both fumagillin and albendazole appeared to be of potential value in controlling L. salmonae infection in trout.
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