A Qualitative and Biochemical Analysis of Biofloc from an Indoor Biofloc Technology System Culturing Oreochromis Karongae.

  • Eva Nambeye
  • Joshua Valeta
  • Wilson Jere
  • Jeremiah Kang’ombe
  • Oswin Chifungwe Chibinga The University of Zambia
  • Francisco Kanyinji
Keywords: Biofloc Technology, Qualitative Analysis, Biochemical Composition, Oreochromis karongae

Abstract

The structure of microbial communities in a Biofloc Technology (BFT) system has great influence on the optimal functioning of the system. This makes understanding the microbial composition in BFT of paramount importance. A study was conducted to characterize the microorganisms in an indoor biofloc technology system. The microorganisms were qualitatively and biochemically analyzed. Qualitative analysis of microorganisms in BFT was carried out using microscopy and plate culture of bacteria and fungi. Isolated bacterial were identified by colony morphology, gram staining and microscopic observation. Catalase test as biochemical test was also used in identifying bacteria. Biochemical analysis of the biofloc was achieved through proximate analysis of nutrients following AOAC (2002) methods. The biofloc sample used in the present study was obtained from culture water of three 1000l circular fiberglass tanks with a working volume of 580l of biofloc water per tank. Oreochromis karongae fingerlings where stocked in the three tanks at a stocking density of 6kg/m3 per tank and cultured for 12weeks. The fish were fed 30% CP on-farm formulated feed (2mm pelleted) with a feeding rate of 1.5% of total estimated fish biomass. Maize flour was added in tanks to maintain an optimum C/N ratio (above 10) for heterotrophic bacteria production. Microscopy of the biofloc water revealed various types of microorganisms which included Protozoa (e.g. ciliates), Zooplanktons (e.g. Rotifers and copepods) and nematodes, heterotrophic bacteria and fungi. It was noted that the bacteria were all heterotrophic bacteria which confirmed their utilisation of organic carbon in the BFT system to produce microbial protein. The biochemical composition of biofloc showed that the nutritional quality of biofloc was appropriate for tilapia with the exception of lipid content which was found to be (3.25%). This value is considered low for aquaculture feed as a range of 5- 10% lipid content in feed is recommended. BFT is a promising field which will enable aquaculture to grow towards an environmentally friendly approach because of the ability of microorganisms to recycle nutrients in the system.

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Published
2023-11-27
How to Cite
1.
Nambeye E, Valeta J, Jere W, Kang’ombe J, Chibinga O, Kanyinji F. A Qualitative and Biochemical Analysis of Biofloc from an Indoor Biofloc Technology System Culturing Oreochromis Karongae. University of Zambia Journal of Agricultural and Biomedical Sciences [Internet]. 27Nov.2023 [cited 25Jul.2024];7(2). Available from: https://journals.unza.zm/index.php/JABS/article/view/1121
Section
Agriculture Sciences