Preliminary assessment of small scale bacterial depuration of Crassostrea gigas and Anadara spp., Gulf of Nicoya, Costa Rica

[EN] Bivalve molluscs are sold without any sanitary control in Costa Rica, which represents a public health risk due to the possible accumulation of pathogenic bacteria. Small scale bacterial depuration treatments were preliminarily evaluated on Crassostrea gigas and Anadara spp. from the Gulf of Ni...

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Bibliographic Details
Main Authors: Vega Corrales, Luis A., Marín-Vindas, Carolina, Pacheco Prieto, Óscar, Zúñiga Calero, Gerardo
Other Authors: Consejo Nacional de Rectores (Costa Rica) CONARE, Gobierno de Costa Rica
Format: Article in Journal/Newspaper
Language:English
Published: Universidad Nacional (Costa Rica) 2013
Subjects:
Online Access:http://hdl.handle.net/10261/192139
Description
Summary:[EN] Bivalve molluscs are sold without any sanitary control in Costa Rica, which represents a public health risk due to the possible accumulation of pathogenic bacteria. Small scale bacterial depuration treatments were preliminarily evaluated on Crassostrea gigas and Anadara spp. from the Gulf of Nicoya, Costa Rica, through the use of a recirculating system with UV irradiation. The levels of Escherichia coli in the water were determined using the MPN method. The MPN of E. coli and the presence of Salmonella spp., Vibrio parahaemolyticus and V. cholerae were determined in molluscs. Results confirm the effectiveness of the E. coli depuration system design in C. gigas and Anadara spp. The MPN of E. coli in the molluscs was reduced between 79% and 100% after 24 h. None of the other types of bacteria were found in the samples analyzed. This is the first C. gigas depuration study in Costa Rica and the first report concerning UV depuration for bacterial indicators of fecal contamination in Anadara spp. This research serves as a basis for the implementation and improvement of mollusc purification conditions in the country. It is recommended to monitor extraction and harvesting areas, as well as to implement the depuration of bivalve molluscs so that traditional producers can offer an innocuous product with added value. [ES] Los moluscos bivalvos son comercializados sin ningún control sanitario en Costa Rica; por tanto, representan un riesgo para la salud pública, debido a que pueden acumular bacterias patógenas. Se evaluaron preliminarmente tratamientos para la depuración bacteriana a pequeña escala de Crassostrea gigas y Anadara spp. en el Golfo de Nicoya, Costa Rica, utilizando un sistema recirculado e irradiado con luz UV. Los niveles de Escherichia coli en el agua se determinaron mediante el método del NMP. A los moluscos se les determinó el NMP de E. coli y la presencia de Salmonella spp., Vibrio parahaemolyticus y V. cholerae. Los resultados confirman la efectividad del diseño del sistema para la depuración de E. coli en C. gigas y Anadara spp. A las 24 h, el NMP de E. coli en los moluscos se redujo entre el 79% y el 100%. No se comprobó la presencia de las demás bacterias en las muestras analizadas. Este es el primer estudio sobre depuración de C. gigas en Costa Rica y el primer reporte de depuración con UV de indicadores bacterianos de contaminación fecal en Anadara spp. Este trabajo sirve de base para implementar y mejorar las condiciones de la depuración de moluscos en el país. Se recomienda monitorear las áreas de extracción y cultivo e implementar la depuración de los moluscos bivalvos para que los productores artesanales puedan ofrecer un producto inocuo y con valor agregado. This research was financed by Consejo Nacional de Rectores (CONARE) (the National Provost Council), as part of the Project entitled “Incremento en la competitividad de las PYMES del Pacífico Central mediante un plan de fortalecimiento interuniversitario regional” (“Increasing competitiveness of SMEs in the Central Pacific by an inter-university regional strengthening plan”), and Ley de Pesca y Acuicultura (Fisheries and Aquaculture Law) from the Government of Costa Rica, and by the Project entitled “Composición nutricional y efecto de las alteraciones bioquímicas, microbiológicas y ambientales en la calidad y la frescura de algunas especies de interés comercial capturadas en el Golfo de Nicoya” (“Nutritional composition and effect of environmental, microbiological and biochemical alterations in the quality and freshness of some commercial species caught in the Gulf of Nicoya”). Peer reviewed