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Diseases of Aquatic Organisms

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DAO 96:97-103 (2011)  -  DOI:

Survey of protozoan, helminth and viral infections in shrimp Litopenaeus setiferus and prawn ­Macrobrachium acanthurus native to the Jamapa River region, Mexico

Magda E. Domínguez-Machín1,2, Martha P. Hernández-Vergara1, Isabel Jiménez-García1, Raúl Simá-Álvarez3, Rossanna Rodríguez-Canul3,*

1Instituto Tecnológico de Boca del Río, Carr. Veracruz-Córdoba Km. 12, 94290 Boca del Río, Veracruz, Mexico
2Instituto Nacional de Pesca, Dirección General de Investigación en Acuacultura, Pitágoras 1320, 3er. Piso. Col. Sta. Cruz Atoyac, 03310 México DF, Mexico
3Laboratorio de Inmunología y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional-Unidad Mérida, Antigua Carretera a Progreso Km. 6, 97310 Mérida, Yucatán, Mexico

ABSTRACT: We surveyed protozoan and metazoan parasites as well as white spot syndrome virus (WSSV) and infectious hypodermal hematopoietic necrosis virus (IHHNV) in white shrimp Litopenaeus setiferus and the palaemonid prawn Macrobrachium acanthurus native to the lower Jamapa River region of Veracruz, Mexico. The presence of parasites and the infection parameters were evaluated in 113 palaemonid prawns collected during the northwind (n = 45), rainy (n = 38) and dry seasons (n = 30) between October 2007 and July 2008, and in 91 shrimp collected in the rainy season between May and June 2008. In L. setiferus, ciliates of the subclass Apostomatia (Ascophrys sp.) were evident in gills, and third-stage larvae of the nematode Physocephalus sexalatus were evident in the stomach. Cestodes of the genus Prochristianella were evident in the hepatopancreas, while some gregarines of the genus Nematopsis, as well as unidentified larval cestodes, were observed in the intestine. Histology identified Ascophrys sp. in association with gill necrosis and tissue melanization. Slight inflammation was observed in intestinal epithelium near cestode larvae. In M. acanthurus, epibionts of the protozoans Epistylis sp., Acineta sp. and Lage­nophrys sp. were observed under uropods, periopods and pleopods. An unidentified ciliate of the Apostomatia was also found in the gills, and Nematopsis was identified in the intestine. No histopathology was observed in association with these parasites. Moreover, neither WSSV nor IHHNV were detected by the polymerase chain reaction (PCR) in any of the L. setiferus or M. acanthurus analysed.

KEY WORDS: Litopenaeus setiferus · Macrobrachium acanthurus · WSSV · IHHNV · Helminths · Mexico

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Cite this article as: Domínguez-Machín ME, Hernández-Vergara MP, Jiménez-García I, Simá-Álvarez R, Rodríguez-Canul R (2011) Survey of protozoan, helminth and viral infections in shrimp Litopenaeus setiferus and prawn ­Macrobrachium acanthurus native to the Jamapa River region, Mexico. Dis Aquat Org 96:97-103.

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