Effects of the pathogenic haemoflagellate, Cryptobia salmositica on brood fish, Oncorhynchus mykiss
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Sexually matured rainbow trout, Oncorhynchus mykiss, were experimentally infected with the pathogenic Cryptobia salmositica. Spawning female trout were more susceptible to cryptobiosis than sexually mature males. Most infected females (seven of nine) with eggs died before or shortly after spawning while all (nine) infected males survived the disease. Also, none of the uninfected females died. Males initially increased milt production and sperm concentration; however semen production declined as the disease progressed. Sperm from infected males fertilized more eggs than those from non-infected males. No differences in weight and survival were observed between progeny of infected and uninfected males.
KeywordsCryptobiosis Mortality Sperms Eggs Hatchlings
We are very grateful to Professor R. Moccia for kindly donating the fish and to the staff of the Alma Aqua Research Centre for technical assistance throughout the study. This research was supported by a grant from the Natural Sciences and Engineering Research Council of Canada to PTK Woo.
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