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| Isolation of Potential Organic Matter-degrading Bacteria and Their Degradation Ability in Tilapia Culture System |
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| KeyWord:organic-matter-degrading bacteria; tilapia culture system; degradation rate; utilization of carbon source |
| Author Name | Affiliation | | HU Xiao-juan | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China | | CAO Yu-cheng | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China | | WEN Guo-liang | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China | | YUAN Cui-lin | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China
Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institutes, Institute of Hydrobiology, Jinan University, Guangzhou 510632, China | | YANG Ying-ying | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China | | LIN Xiao-tao | Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institutes, Institute of Hydrobiology, Jinan University, Guangzhou 510632, China | | LI Zhuo-jia | Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture
Key Lab. of Fishery Ecology and Environment, Guangdong Province
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China |
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| Abstract: |
| Enhanced degradation of organic matter in aquaculture systems has drawn increasing interests. A study was performed to screen and identify organic-matter-degrading probiotic bacteria from tilapia culture system using 16S rDNA method. Their ability to degrade and utilize organic carbon in leachate and original solution of tilapia feed was also determined using COD and ECO microplate method, respectively. Six strains were found to significantly degrade organic matter in the leachates. After 72 h incubation, the degradation rates of organic matter were up to 53.49% for the strain D51, followed by the strain D11（48.83%）. The strains D51, D11 and D45 also had high abilities to degrade organic matter in the original feed solution. After 15 d incubation, they decreased COD values in the original feed solution by 52.46%, 46.03% and 46.03%, respectively. The strain D45 showed significantly stronger carbon utilization than the other strains did, with the strains D52 and D53 being the lowest. 16S rDNA identification showed that D11 was Bacillus sp. and the strain D45, D51, D52 and D53 were Exiguobacterium sp. These results suggest that the strains D11, D45 and D51 have great organic degradation potential and warrant more indepth studies. |
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