04244nam a2200457 a 4500 20260817171005.0 121014s2010 th ad ||| 000 0 eng d .b12143066 AIT Thesis no.AQ-10-01 Ngo Thi Thanh Huong Bacterial population in intensive tilapia (Oreochromis niloticus) culture ponds in Hai Duong Province, Vietnam Pathum Thani, Thailand : Asian Institute of Technology, 2010 1 online resource (58 leaves) : col. ill., charts Thesis ; no. AQ-10-01 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Aquaculture and Aquatic Resources Management, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2010 Three intensive tilapia ponds were studied to determine the variation of bacterial population in Hai Duong province, Vietnam. Bacteria were identified to genus or species level. Total bacteria count in sediment ranged from 6.49 x105 to 1.29 x106 cfu g-1. In total, 11 bacterial genera and 13 species were identified from pond sediments, in which both Gram-negative and Gram-positive rod-shaped bacteria dominated the population accounting for 52% and 48%, respectively. Bothbeneficial and harmful bacteria were found in sediments, in which the harmful bacterial species dominated (62.5%) and appeared more at the beginning of culture. The harmful bacteria were Pseudomonas fluorescens, Pseudomonas sp., Vibrio pectenicida, Enterococcus, sp.HD31, Enterococcus sp.HD1, Vibrio damsella, Aeromonas sp.HD5, Vibrio sp. HD7, Vibrio sp.HD331, Aeromonas sp.HD361, Enterococcus sp.HD371, Vibrio sp.V31, Aeromonas. Hydrophyla and Pseudomonas putida. In contrast, beneficial bacteria accounted for 20.8% only of total isolates. The beneficial bacteria were Carnobacterium inhibens, Lactobacillus plantarum, Bacillus cereus, Lactobacillus delbrueckii and Bacillus pumilus; they appeared more in the later stage of culture period. This study did not find any correlation between bacteria quantity and the concentration of NH4+, NO2-N, NO3-N in pond water and OC, TP in sediment (P>0.05). However, the significant correlations between NH4 and NO2, NO2 and NO3 concentration were found and the highest concentrations of nitrite and nitrate concentration were found in the fifth culture month. Moreover, this study also showed the highly significant difference (P<0.01) in nitrate reducing bacteria, sulphate reducing bacteria count, and nitrite oxidizing bacteria (P<0.05) during the culture period. Nile tilapia Vietnam Hai Duong Ponds Vietnam Hai Duong Bacteria Vietnam Hai Duong Aquaculture Vietnam Hai Duong Gallardo, Wenresti G., Chairperson Yakupitiyage, Amararatne, Examination Committee Thakur, Dhirendra. P., Examination Committee Bhujel, Ram, Examination Committee Lai Thuy Hien, Examination Committee Mohan, C. V., Examination Committee ASEAN Foundation Scholarship , Scholarship Donor Asian Institute of Technology. Thesis ; no. AQ-10-01 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B01789 .b12143066 mnait j 240404 0 141210 m a j 0 000:001:PDF:b1214306:001878:0:0:0:0:0:0 Abstract -- AIT Thesis no. AQ-10-01 n mnait mnait 20 Barcode : 30050120697106 CREATED : 2014-11-11 RECORD # : i12825876 LPATRON : 1026607 LCHKIN : 2016-04-11 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 0 Barcode : 30050120390504 CREATED : 2014-11-11 RECORD # : i12825906 LPATRON : 1026607 LCHKIN : 2017-04-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 2 TOT CHKOUT : 1 TOT RENEW : 1 10493 10493 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-10-01 30050120697106 2026-08-17 17:10:05 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-10-01 30050120390504 2026-08-17 17:10:05 2 2026-08-17 20