Resumen

CABRERA, Fermin  y  RUBIO, Manuel. Protozoan Epibionts in  Shrimp Farming Litopenaeus vannamei. Rev. Fac. Cienc. Vet. [online]. 2012, vol.53, n.2, pp.69-80. ISSN 0258-6576.

In shrimp (L. vannamei) farming, alterations in health and in productive performance occur. These disorders result from the presence of ciliated epibionts protozoan. In Cuba, there is no data available on how their expression varies as the culture progresses. The purpose of this study was to determine the general prevalence, the specific prevalence, and the degree of severity of the effects caused by epibionts protozoan during the fattening cycle of shrimp. To conduct the study, 2880 shrimp samples (juvenile and adults) were evaluated at the Tunas de Zaza shrimp farm for three cycles. The trend of the evaluated parameters was studied, based on weekly analysis of fresh samples and the obvious characteristics of each species. The results were analyzed using trend models, based on the least squares method. The possible differences among specific prevalence were tested by the Kruskall Wallis and Mann Whitney U nonparametric tests, using the statistical program SPSS V15. The results show that the genera of epibionts protozoa observed which exhibited greater degrees of severity (DS) in their lesions were Epistylis sp., with higher frequency (DS: 1 to 4), followed by Acineta sp. (DS: 1 to 4), Zoothamnium sp. (DS: 1 to 2), and Ascophrys (GS: 1), with a rising behavior as the culture progressed.

Palabras clave : Prevalence; severity; Litopenaeus vannamei; epibionts; shrimp.

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