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Influence of environmental temperature on type and spoilage potential of bacterial microflora of tropical fish in rearing ponds.

[In Portuguese. / En portugais.]

Author(s) : LEITAO M. F. de Freitas, SILVEIRA N. F. de A.

Type of article: Article

Summary

The influence of environmental temperature on the type and spoilage potential of bacterial microflora prevailing in the water and fish surface in rearing ponds in Brazil was evaluated. In experimental trials with inoculations of microorganisms present in fish surface mucus, in muscle extract broth, and trypticase soy broth, followed by incubation at 4 deg C, the slow growth both of psychrophiles and hydrogen sulphide producers, rarely reaching populations higher than 1000 CFU/milliL after 5 days incubation, was noticed. However, the influence of the water temperature prevailing in the original environment in relation to the growth rate of the contaminating microflora incubated at 4 deg C was confirmed. When the original water temperature varied between 20 and 25 deg C there was a 3.3 log cycles increase in the psychrotrophilic microflora after 7 days incubation at 4 deg C, while this increase reduced to 1.67 log cycles when the original water temperature varied between 25 and 30 deg C.

Details

  • Original title: [In Portuguese. / En portugais.]
  • Record ID : 1994-3021
  • Languages: Portuguese
  • Source: Colet. ITAL - vol. 23 - n. 1
  • Publication date: 1993/01
  • Document available for consultation in the library of the IIR headquarters only.

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