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Does time matter in Enteromyxum leei (Myxozoa) fish-to-fish experimental transmission?

AuthorsPicard-Sánchez, Amparo; Estensoro, Itziar ; Pozo, R. del; Piazzon de Haro, María Carla ; Sitjà-Bobadilla, Ariadna
Issue Date12-Sep-2019
Citation19th International Conference on Diseases of Fish and Shellfish (2019)
Abstract[Introduction]: Enteromyxum leei is a myxozoan histozoic parasite that infects the intestine of several teleostean fish species. In the gilthead sea bream (Sparus aurata) it provokes a chronic disease, with anorexia, delayed growth with weight loss, cachexia, reduced marketability and mortality. Direct fish-to-fish transmission has been demonstrated for E. leei via effluent, cohabitation, oral and anal routes. Effluent transmission trials in GSB are set up for long times of exposure (70-120 day) to water from tanks holding infected fish (donors, D). However, the minimum time of exposure to infect fish has not been established, nor the possible effect on the fish immune response. [Methodology]: A D tank was setup to effluent water to two equal recipient (R) tanks, each with 50 naïve fish. R1 tank was kept with the same number of fish all the trial, whereas in R2 tank, some fish were left all the time (R2-13) and 10 fish were removed at 1 (R2-1), 3 (R2-3), 5 (R2-5) and 7 (R2-7) weeks post exposure (wpe) and placed in separated tanks with non-infected water. At 9 wpe, a non-lethal sampling was done to evaluate the progression of the infection and a final sampling at 13 wpe to obtain intestinal and serum samples. [Results]: No effect of time of exposure was detected on prevalence of infection, as it varied between 100% (R2-1) and 80% (R2-3). Although no significant differences were found in weight, length and condition factor among R groups, the weight decrease typical of the infection was lowest in R2-1. The percentage of fish with specific antibodies against E. leei varied between 50 and 100%. [Conclusion]: From the significant correlations found among the different variables, we can conclude that 1) the earlier the infection is achieved, the higher amount of Abs are produced, 2) the longer exposure times, the higher impact on biometrical values, 3) the higher reduction of growth, the higher extension of the infection along the intestine and the higher percentage of fish with antibodies. Further trials have to be performed under lower temperatures and exposure times shorter than one week.
DescriptionComunicación presentada en la 19th International Conference on Diseases of Fish and Shellfish, celebrada en Oporto (Portugal) del 9 al 12 de septiembre de 2019.
Appears in Collections:(IATS) Comunicaciones congresos
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