Kannapiran E, Ravindran J, Chandrasekar R, Kalaiarasi A
Alagappa University, Directorate of Distance Education, Karaikudi - 630 003, India.
J Environ Biol. 2009 Sep;30(5 Suppl):791-5.
Microbiological studies in a modified extensive shrimp culture system at Nambuthalai, southeast coast of India were carried out fora period of 120 days. Population dynamics and distribution profile of luminous bacteria and total heterotrophic bacteria in the water sediment and animal samples were monitored. Luminous bacteria associated with exoskeleton, gills and gut were isolated and quantified. The total heterotrophic bacterial counts ranged from 1.3 x 10(4) to 25.3 x 10(4) CFU ml(-1) in water and 1.5 x 10(6) to 26.2 x 10(6) CFU g(-1) in sediment. The V. harveyi population density varied between 0.6 x 10(4) and 8.8 x 10(4) LCFU ml(-1) in water and from 1.2 x 10(6) to 10.4 x 10(6) LCFU g(-1) sediment respectively. The gut of the animal was found to harbor high density of V. harveyi than gills and exoskeleton. The total heterotrophic bacteria and V. harveyi population density showed increasing trend during the culture period. The high V harveyi density observed in this study at the end of the culture period correlated with the outbreak of white spot disease.
在印度东南海岸楠布塔莱的一个改良型粗放对虾养殖系统中进行了为期120天的微生物学研究。监测了水、沉积物和动物样本中发光细菌和总异养细菌的种群动态及分布情况。分离并定量了与外骨骼、鳃和肠道相关的发光细菌。水样本中总异养细菌计数范围为1.3×10⁴至25.3×10⁴CFU ml⁻¹，沉积物样本中为1.5×10⁶至26.2×10⁶CFU g⁻¹。哈维氏弧菌的种群密度在水样本中分别为0.6×10⁴至8.8×10⁴LCFU ml⁻¹，在沉积物样本中为1.2×10⁶至10.4×10⁶LCFU g⁻¹。发现动物肠道中哈维氏弧菌的密度高于鳃和外骨骼。在养殖期间，总异养细菌和哈维氏弧菌的种群密度呈上升趋势。本研究在养殖期末观察到的高哈维氏弧菌密度与白斑病的爆发相关。
