Induced resistance in rainbow trout, Oncorhynchus ...

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Title Induced resistance in rainbow trout, Oncorhynchus mykiss (Walbaum), to gill disease associated with the microsporidian gill parasite Loma salmonae
Author(s) David J. Speare, H. J. Beaman, S. R. M. Jones, R. J. Frederick Markham, G. J. Arsenault
Journal Journal of Fish Diseases
Date 1998
Volume 21
Issue 2
Start page 93
End page 100
Abstract Three exposure studies were conducted to assess whether oral exposure of naive rainbow trout to Loma salmonae spores at 2 temperatures (10 and 14.5 degrees C) provides protection against disease upon rechallenge with spores; to repeat the study at 14.5 degrees C using fish which had recovered from experimental infection; and to assess if exposure to fresh or frozen semipurified preparations of L. salmonae would result in xenoma development after fish were exposed by ip injection. A total of 90-95% of fish which received oral exposure to L. salmonae-infected gill tissue at 14.5 degrees C developed xenomas by week 5. None of the fish at 10 degrees C developed xenomas, and xenomas did not develop when this group was moved to 14.5 degrees C. When rechallenged at weeks 24 and 36, protection from xenoma formation was virtually complete compared with naive fish. None of the trout that had previously been infected developed xenomas upon rechallenge. One of 21 fish that received frozen spores developed branchial xenomas compared with 13 of 22 fish that received fresh spores ip and 18 of 23 that were given fresh spores orally. Subsequent to oral rechallenge, 9 of 16 fish that had previously received frozen spores ip, and all 16 fish that had previously received fresh spores ip did not develop xenomas. It is concluded that infection with L. salmonae induces strong protection against the disease upon re-exposure to spores, and that protection does not depend on completion of the parasite's life cycle..

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