[Preliminary study of microbiological contamination of the mollusc Mesodema donacium (Machas)]
1991
Zazopulos G, Miguel | Prado A, Bernardo (Universidad Tecnica Federico Santa Maria, Vina del Mar (Chile)) | Saavedra G, Manuel | Garcia Tello, Patricio
Mesodesma donacium (macha) is a filter feeding bivalve. As such it retains both aloctonous and autochtonous bacteria. In the present study we analyzed the number of psicrotrops (cfe/ml), fecal coliforms and fecal streptococci (MPN/100 ml) from the whole animal. Samples were taken from five different places on the coast of Valparaiso, Chile. A part of the sample was submited to the survival method used by local fishermen (a bag immersed in sea water). Samples were also bought from the market. The concentration of bacteria in the mollusc depends on a great extent on the number of them in the sea water. Fecal streptococci show a selective accumulation upon fecal coliform in the mollusc. The inverse relation is found in the sea water. The number of contaminant bacteria is particularly higher in the mollusc bought, and in the ones submitted to the survival method, than in the natural molluscs. We suggest to put mollusc in natural sea water free of contamination for its correct preservation
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