Efeitos da emissÃo dos efluentes domÃsticos na proliferaÃÃo de Aeromonas spp. em Ãguas de superfÃcie e pescado do estuÃrio do Rio Bacanga, SÃo Luis â MaranhÃo / The issuance of domestic sewage in the proliferation of Aeromonas spp. in surface water and fish of the estuary of the River Bacanga, SÃo Luis - MaranhÃo

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

07/03/2005

RESUMO

For the detection of Aeromonas were collected 90 samples of surface water and 30 fish in the estuary of the river in St. Louis Bacanga / MA in the period March to October 2004. The samples were submitted, while the method of direct plating on Gelatin Phosphate Salt Agar (Agar GSP plus 20flglrnL of ampicillin) to count (CFU / g or RNL) and the determination of Most Probable Number (NMP/100rnL or g) by the multiple tube technique, using trypticase soya broth (TSB broth with ampicillin to 20flglrnL). The fish species examined were: Bagre (Pimelodus maculatus), Mullet (Mugil cephalus), plaice (Pleuronectes platessa), Silver (Hemigrammus Rodway), Sardines (Opisthonema oglinum). The results show a wide spread of Aeromonas in the estuary. For samples of water and the fish counts ranged from 40 to 1.3 x108 CFU / NLOs and 3.2 x102 to 5.8 x106 CFU / g respectively, and the highest rates were obtained at points close to the emission of domestic sewage. The values for the NMP / lOOrnL of water ranged from 2.3 x104 and 1.6 x107 and 230 to 24,000 / g for fish. The highest rates of Aeromonas were observed in the month of highest intensity of rainfall, April, and lowest in October, corresponding to the peak of drought in the region, thus a possible seasonal effect in the age of the bacteria in the environment studied. Of the 751 strains isolated from water samples, 582 were positive for Aeromonas, with 52.70. 10 were. caviae, 23.8% A. hydrophila, 19.5%, A. A. veronii and 3.7% sobria. For the isolated fish (245 strains) 184 were identified as Aeromonas and 43.4% of A. caviae, 28.2% of A. hydrophila, 26.6% A. veronii and 1.6% of A. sobria. Regarding the physico-chemical parameters measured in surface waters of the estuary of the river Bacanga, only the temperature, salinity and pH, had significant correlations. In general, the strains of Aeromonas sp. were sensitive to most antimicrobials tested, except ampicillin, to which 100% of strains were resistant.

ASSUNTO(S)

microbiologia aplicada aeromonas estuÃrio efluentes domÃsticos aeromonas domestic wastewater estuary

ACESSO AO ARTIGO

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