Qualidade microbiológica da água e ostras em uma área de cultivo de moluscos bivalves no Estuário do Rio Graciosa, Taperoá, Bahia

Abstract

The cultivation of oysters (Crassostrea rhizophorae) in the city of Graçiosa-BA is to influence the waters of the mouth of the Una river, water body that suffers with the release of domestic sewage by a lack of sanitation in the city. On this basis, this study aimed to analyze the microbiological water quality and oyster cultivation in an area of bivalve molluscs, using the group as bioindicators of fecal coliforms and Salmonella sp. Were performed to 11 samples of water and 12 of oysters in the period December 2010 to November 2011 with monthly sampling at three points of water and one oyster. The Most Probable Number of thermotolerant coliform in water samples at the point P1 (upstream of cultivation) ranged from <1.8 to 2.4 x 104 NMP/100 mL, the point P2 (cultivation area) ranged from <1, 8 to 1.6 x 105 NMP/100 mL Point and P3 (downstream of cultivation) values were <1.8 to 5.4 x 105 NMP/ 100mL. In the oyster samples NMP/100 g was <1.8 to 3.5 x 104. The presence of Salmonella sp. was observed both in the samples water (12%) as the oyster samples (25%). The high microbial load in the samples shows that the area of the estuary of the river Una, not favors the cultivation of bivalve molluscs, except that the bodies pass through a purification process or heat treatment before being forwarded to the consumer.