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Effects of fish age versus size on the development of whirling disease in rainbow trout

We examined the effects of both fish age and size on the development of resistance to whirling disease in Erwin strain rainbow trout. Previously, we demonstrated that juvenile rainbow trout became resistant to development of the disease when first exposed to triactinomyxons of the parasite Myxobolus...

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Published in:Diseases of aquatic organisms 2005-01, Vol.63 (1), p.69-76
Main Authors: RYCE, Eileen K. N, ZALE, Alexander V, MACCONNELL, Elizabeth, NELSON, Mark
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ZALE, Alexander V
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description We examined the effects of both fish age and size on the development of resistance to whirling disease in Erwin strain rainbow trout. Previously, we demonstrated that juvenile rainbow trout became resistant to development of the disease when first exposed to triactinomyxons of the parasite Myxobolus cerebralis at about 9 wk post-hatch when raised at 12 degrees C, but ages and sizes of fish used in that experiment were confounded (Ryce EKN, Zale AV, MacConnell E [2004] Dis Aquat Org 59:225-233). In this study, rainbow trout of the same age and different sizes, and the same size and different ages, were exposed to the parasite to distinguish the influences of age and size. Fish were reared at 3 different water temperatures prior to exposure to produce groups with different growth rates and were exposed to the parasite at 7 or 9 wk post-hatch. Disease severity was affected by both age and size at first exposure, but the effects were not independent. An increase in fork length from 36 to 40 mm among fish exposed at 7 wk post-hatch did not confer increased resistance, but the same increase in size at 9 wk post-hatch did. Similarly, an increase in age from 7 to 9 wk post-hatch among fish exposed at 36 mm fork length did not confer increased resistance, but the same increase in age at 40 mm did. Rainbow trout must be both 9 wk post-hatch or older and at least 40 mm in fork length at time of exposure to exhibit enhanced resistance to whirling disease. Resistance to disease was not associated with the level of skeletal ossification.
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Fish were reared at 3 different water temperatures prior to exposure to produce groups with different growth rates and were exposed to the parasite at 7 or 9 wk post-hatch. Disease severity was affected by both age and size at first exposure, but the effects were not independent. An increase in fork length from 36 to 40 mm among fish exposed at 7 wk post-hatch did not confer increased resistance, but the same increase in size at 9 wk post-hatch did. Similarly, an increase in age from 7 to 9 wk post-hatch among fish exposed at 36 mm fork length did not confer increased resistance, but the same increase in age at 40 mm did. Rainbow trout must be both 9 wk post-hatch or older and at least 40 mm in fork length at time of exposure to exhibit enhanced resistance to whirling disease. 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source Freely Accessible Science Journals - check A-Z of ejournals
subjects Age Factors
Animal aquaculture
Animal productions
Animals
Biological and medical sciences
Body Size
Bone and Bones - pathology
Fish Diseases - immunology
Fish Diseases - mortality
Fish Diseases - parasitology
Fundamental and applied biological sciences. Psychology
Immunity, Innate - immunology
Myxobolus cerebralis
Oncorhynchus mykiss
Pisciculture
Protozoan Infections, Animal - immunology
Protozoan Infections, Animal - mortality
Spores, Protozoan - immunology
Staining and Labeling
Swimming - physiology
Temperature
Vertebrate aquaculture
title Effects of fish age versus size on the development of whirling disease in rainbow trout
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