African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5238

Full Length Research Paper

Microbiota of freshwater catfish species, Filhote (Brachyplatystoma filamentosum) and Dourada (Brachyplatystoma rousseauxii) from the Amazon Region (Belém-Pará-Brazil)

Evelyn Ivana Trindade Damasceno
  • Evelyn Ivana Trindade Damasceno
  • Food Science and Technology Program, UFPA, Rua Augusto Correa 01–Guamá, Belém-Pará, Brazil.
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Lauana Natasha da Gama Pantoja
  • Lauana Natasha da Gama Pantoja
  • Food Science and Technology Program, UFPA, Rua Augusto Correa 01–Guamá, Belém-Pará, Brazil.
  • Google Scholar
Hamilton Mendes de Figueiredo
  • Hamilton Mendes de Figueiredo
  • Food Science and Technology Program, UFPA, Rua Augusto Correa 01–Guamá, Belém-Pará, Brazil.
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Luiza Helena Meller da Silva
  • Luiza Helena Meller da Silva
  • Food Science and Technology Program, UFPA, Rua Augusto Correa 01–Guamá, Belém-Pará, Brazil.
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Antônio Manoel da Cruz Rodrigues
  • Antônio Manoel da Cruz Rodrigues
  • Food Science and Technology Program, UFPA, Rua Augusto Correa 01–Guamá, Belém-Pará, Brazil.
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  •  Received: 28 May 2015
  •  Accepted: 25 September 2015
  •  Published: 07 April 2016

Abstract

This paper identified the bacterial flora composition and its influence on the microbiological spoilage process in economically important fish species: Filhote (Brachyplatystoma filamentosum) and Dourada (Brachyplatystoma rousseauxii) in the Amazon region. Microbiological characterization was performed: counts of total mesophilic aerobic bacteria, psychrotrophic bacteria and coliforms at 35 and 45°C, respectively. Bacteria were also isolated through seeding in agar surface using Violet Red Bile Glucose (VRBG) for enterobacteria strains and Baird-Parker Agar with Egg-Yolk Tellurite for Staphylococcus species, both with incubation at 36°C for 48 h. The bacteria isolated were identified using the API 20E kit (Enterobacteria), and Gram-positive bacteria with API Staph (Staphylococci). Finally, the lag phase for strain growth was measured using spectrophotometry readings (620 nm) at different temperatures (10, 15 and 37°C). The mesophilic aerobic bacteria counts for fresh fish samples ranged from 5.21 to 7.64. The count ranges of psychrotrophic aerobic bacteria found were 5.11 – 6.91 log CFU/g. They also had an average score above 103 MPN/g for total coliforms. The most predominant were Hafnia alvei, Pseudomonas luteola, Staphylococcus xylosus and Staphylococcus lugdunensis. When subjected to temperature of 10°C, the strains achieved growth after 6 h (p<0.05).

Key words: Spoilage, catfish, Brachyplatystoma filamentosum, Brachyplatystoma rousseauxii.