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Using diazotrophic bacteria for biomass production of microalgae

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Sayeda M. Ali1,*, Hoda S. Nasr2and Mohammed T. Abbas3
1Microbiology Department, National Institute of Oceanography and Fisheries, Aswan Research Station,
Egypt; 2Hydrobiology Department, National Institute of Oceanography and Fisheries, El-Qanater
Research Station, Egypt; 3Microbiology Department, Faculty of Agriculture and Natural Resources,
Aswan University, Egypt
* Corresponding author: National Institute of Oceanography and Fisheries, Aswan Research Station,
western of high dam, Aswan, Egypt; Mobile: 002-01118211434; E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT
Microalgae are necessary for aquaculture ponds, where they represent the natural
nutritional base, the primary source of the food chain. They are also stabilizers of pond
water quality. Therefore, in this study different concentration of Azospirillum brasilense
or Azotobacter chroococcum were used as growth-promoting bacteria for biomass
production of Chlorella vulgaris in the Bold’s basal medium and in the ground water
supplemented with various concentrations of aquaculture water. The obtained results
indicated that, bacterial inoculation significantly increased chlorophyll a (>227 – 385%)
in the Bold’s basal medium for Chlorella vulgaris. Also in the ground water experiment
inoculation did significantly increased net primary productivity, chlorophyll a and dry
weight. Dissolved oxygen, chemical oxygen demand, nitrite, nitrate, ammonia and total
dissolved solids were also increased as well. The obtained results support using
diazotrophic bacteria as a growth promoter for increasing natural food. More studies
should be done to be used to evaluate the use of such bacteria on a large-scale and
decide how much can be included in the fish cultures.

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