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Densidade bacteriana e organismos coliformes em águas e ostras do complexo estuarino de Paranaguá, Paraná, Brasil

2008; INSTITUTO DE PESCA - APTA - SEC. DE AGR. E ABAST. - SP; Volume: 34; Issue: 1 Linguagem: Inglês

1678-2305

Hedda Elisabeth Kolm, Theresinha Monteiro Absher,

Child Nutrition and Water Access

The objective of the present research was to evaluate quantitatively the total coliforms and E. coli in oysters and adjacent waters of the Paranagua Estuarine Complex and its interrelation with biotic and abiotic factors, as well as evaluate the contamination from coliforms of oysters sold in the Paranagua market. Water and oysters were collected from April of 1997 to February of 1998, in the Paranagua Estuarine Complex and oysters were bought from the same three merchants in the market throughout the research. Temperature, salinity and seston of the water and total heterotrophic bacteria, bacterial biomass, total coliforms and Escherichia coli in the water and in the oysters were analyzed. Temperature was higher in summer, and salinity and seston in the winter. Total heterotrophic bacteria and bacterial biomass in the water were heigher in Ostras River in July and January and total coliforms, in July. The highest values of total coliforms in oysters were observed in Rasa Island, in January. In the water, the number of E. coli was larger than 2,419 MPN.100 mL-1 in Cobras’ Island in April and in Puruquara in July. In relation to the oysters from the market of Paranagua, the largest values of total coliforms were registered in April and December, and E. coli in December, both from merchant 2. The results show that oysters collected in the environment as well as those from the Municipal Market of Paranagua cannot be consumed raw without previous purification and that there is a need of an urgent reform of the legislation, including the analysis of E. coli in the oysters to be marketed.