title: Recovery of Escherichia coli in fresh water fish, Jenynsia multidentata and Bryconamericus iheringi.
abstract: Escherichia coli concentration was determined in digestive tract and muscle of Jenynsia multidentata and Bryconamericus iheringi through bioassays. Field experiments were also conducted with J. multidentata collected in the Suquía River, Córdoba, Argentina. E. coli was quantified by the most probable number, using lauryl sulphate tryptose broth with 4-methylumbelliferyl-beta-D-glucuronide. For bioassays, E. coli concentrations 10(2), 10(3), 10(4), 10(5), 10(6)CFU/ml were introduced in aquarium water. E. coli was recovered from the digestive tracts of J. multidentata and B. iheringi in all the concentrations assayed. Bacterial critical load in water for the recovery of bacteria from muscle, was 10(3)CFU/ml for both species. The regression analysis between E. coli loads in water and those found in digestive tract and muscle showed a positive linear relationship for J. multidentata and B. iheringi. The same relation was observed between the concentration of bacteria in digestive tract and muscle in both species. In field experiments, E. coli was recovered from digestive tract and muscle of J. multidentata. The presence of E. coli in the studied fish suggests that they can carry bacteria to non-polluted waters. However, further studies are necessary to evaluate its significance for public and environmental health.
authors.affiliation: Cátedra de Diversidad Animal II and Cátedra de Microbiología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Avda.Vélez Sársfield 299, Córdoba 5000, Argentina.
authors.forename: María Cecilia
authors.initials: MC
authors.lastname: Guzmán
authors.forename: María de los Angeles
authors.initials: Mde L
authors.lastname: Bistoni
authors.forename: Lucía María
authors.initials: LM
authors.lastname: Tamagnini
authors.forename: Rubén Darío
authors.initials: RD
authors.lastname: González
mesh_terms: D000818:Animals; D001118:Argentina; D001681:Biological Assay; D004064:Digestive System / Q000382:microbiology; D004755:Enterobacteriaceae / Q000254:growth & development; D004784:Environmental Monitoring; D004926:Escherichia coli / Q000201:enzymology / Q000302:isolation & purification*; D005243:Feces / Q000382:microbiology; D005399:Fishes / Q000382:microbiology*; D005618:Fresh Water / Q000382:microbiology*; D005966:Glucuronidase / Q000378:metabolism; D009132:Muscles / Q000382:microbiology; D014871:Water Microbiology
chemical_list: D005966:Glucuronidase