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Infection dynamics of Cichlidogyrus tilapiae and C. sclerosus (Monogenea, Ancyrocephalinae) in Nile tilapia (Oreochromis niloticus L.) from Uganda

Published online by Cambridge University Press:  27 July 2011

P. Akoll ,
M.L. Fioravanti ,
R. Konecny  and
F. Schiemer
P. Akoll*
Affiliation:
Department of Zoology, Faculty of Science, Makerere University, PO Box 7062, Kampala, Uganda Department of Freshwater Ecology, University of Vienna, Althanstraße 14, 1090Vienna, Austria
M.L. Fioravanti
Affiliation:
Department of Veterinary Public Health and Animal Pathology, University of Bologna, Via Tolara di Sopra, 50 – 40064Ozzano Emilia (BO), Italy
R. Konecny
Affiliation:
Department of Freshwater Ecology, University of Vienna, Althanstraße 14, 1090Vienna, Austria Environment Agency Austria, Spittelaur Lande 5, 1090Vienna, Austria
F. Schiemer
Affiliation:
Department of Freshwater Ecology, University of Vienna, Althanstraße 14, 1090Vienna, Austria
*
*E-mail: akollp@gmail.com
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Abstract

The infection dynamics of the gill monogeneans Cichlidogyrus tilapiae and C. sclerosus on Oreochromis niloticus with respect to habitat type (reservoir, stream, ponds and cages), host sex, size and seasons was determined between January and November 2008. During the study period, 45.2% of the 650 fish examined were infected with Cichlidogyrus spp. The infected hosts harboured an average of 8.6 ± 3.4 parasites/fish. Across habitat types, the proportion of infected fish was not statistically different. In contrast, the number of parasites recorded on infected fish from different habitat types differed significantly. The highest parasite number was recorded in reservoir-dwelling fish and lowest in stream-dwelling hosts. Concerning sex, more female O. niloticus were infected and harboured a high number of parasites than male and sexually undifferentiated fish. A weak negative relationship was found between rainfall and monthly parasite infections. However, a higher number of parasites and proportion of infected hosts were found during dry than in wet seasons, except in ponds. Results of this study show that differential exposure due to changes in fish behaviour associated with habitat modification and sex may account for the infection difference across the sampled sites. Meanwhile, rainfall and the associated hydrological events are important factors regulating monogenean infections in tropical aquatic environments. The continuous presence of Cichlidogyrus spp. in fish provides evidence of possible parasite outbreaks, indicating the application of biosecurity measures as crucial for the success of intensive fish farming.

Type
Research Papers
Information
Journal of Helminthology , Volume 86 , Issue 3 , September 2012 , pp. 302 - 310
Copyright
Copyright © Cambridge University Press 2011

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