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Monitoring parasite incidence in gilthead sea bream held in experimental and production cages: long-term effect of a supplemented diet on fish health

AuthorsPalenzuela, Oswaldo ; Browdy, C. L.; Petropoulos, Y.; Katribouzas, N.; Pozo, R. del; Sitjà-Bobadilla, Ariadna
Issue DateSep-2015
Citation9th International Symposium on Fish Parasites (2015)
AbstractGilthead sea bream (GSB) production in net cages is hampered by the incidence of parasitic diseases. The monogenean blood-sucking Sparicotyle chrisophrii and the emaciating intestinal myxozoan Enteromyxum leei, are the most widely reported pathogenic parasites in these conditions, and tools for their prevention and control in production conditions are rather limited. Lack of effective and licensed treatments and pressure for a smaller environmental footprint of the activity has stimulated the development of bioactive additives and supplemented feeds as a possible strategy to Mitigate health problems in cage-cultured fish. Some of these products have clearly demonstrated biocidal and/or immunomodulating activity at laboratory scale with certain host-pathogen models. However, there is a significant lack of corroborating data from commercial scale cage production conditions, wherein fish must cope with multiple, sustained biotic and abiotic stressors. Since different parasites exploit different host niches using a wide repertoir of pathogenic mechanisms, it is important to evaluate the possible benefits of such strategies under real world conditions. In this study, groups of GSB fed a control and an experimental diet with commercial prebiotics and active ingredients (contained in Previda® and NextEnhance® supplements) were reared in triplicate experimental cages in Western Greece. Biometrical, haematological and parasitological data (focused on prevalence and abundance of gill monogeneans Sparicotyle chrisophrii and Furnestinia echeneis) was collected monthly (9 samplings along 14 months), with additional intermediate and final samplings analysing intestinal and kidney endoparasites. In addition, subsets from both groups were transferred to full-size production cages, and reared to commercial size (roughly 16 months). At harvest, these fish were also sampled for parasites, including a quantification of Enteromyxum leei load on the intestines using qPCR. Analyses of biometrical, haematological and parasitological data from both groups are presented and the differences between both fish groups are discussed. While certain differential effects can be observed with the feeds tested, the study highlights the difficulties to translate sensible nutritional prophylaxis strategies into immediate solutions for complex, multifactorial processes such as different host-parasite relationships.
DescriptionComunicación presentada en el 9th International Symposium on Fish Parasites, celebrado en Valencia, España, del 31 de agosto al 4 de septiembre de 2015
Appears in Collections:(IATS) Comunicaciones congresos
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