Author(s): Md Shariful Islam, Subrina Khatun and Syed Lutfor Rahman

Abstract: Shrimp farming is a promising sector in Bangladesh since return from export earning of this commodity is considerably high. With the rapid development of grow-out farms, good husbandry and environmental problems developed as the shrimps were stressed and weakened under adverse conditions. The total bacterial load during the sampling period as varied from 7.4*10⁵to 8.1*10⁵ CFU/g of Hepatopancreas, 7.10*10⁵ to 9.11*10⁵CFU/g of digestive tract, 7.1*104 to 6.6*10⁵CFU/ml of water and 8.68*104 to 4.88*105 CFU/g of soil in diseased pond. At this time, the total bacterial load during the sampling period as varied from 9.4*10³to 7*10⁴CFU/g of Hepatopancreas, 7.2*10³to 4.8*10⁴CFU/g of digestive tract, 6.1*10²to 2.8*10³CFU/ml of water and 8.1*10³ to CFU/g of soil in non-diseased pond. Total number of bacteria in Hepatopancreas, digestive tract of shrimp, and water & soil of the diseased pond are differ distinctly from non-diseased pond. The pathogenic bacteria load during the sampling period as varied from 1.16*10³ to 1.9*10³CFU/g of Hepatopancreas, 1.29*10³ to 1.75*10³CFU/g of digestive tract, 1.1*10³ to 3.1*10³ CFU/ml of water and 7.5*10² to 2.3*10³CFU/g of soil in diseased pond. At this time, the pathogenic bacteria load during the sampling period as varied from 1.39*10²to 4.3*10²CFU/g of Hepatopancreas, 4.2*10² to 7.1*10²CFU/g of digestive tract, 7.5*10¹to 5.1*10²CFU/ml of water and 3.2*10²to 5.1*10²CFU/g of soil in non-diseased pond. Total number of pathogenic bacteria in Hepatopancreas, digestive tract of shrimp, and water & soil of the diseased pond are differ distinctly from non-diseased pond. Early Mortality Syndrome (EMS) or Acute Hepatopancreatic Necrosis Disease (AHPND) is occurring for presence of Vibrio parahaemolyticus. That is a pathogenic bacteria. So, this study shows a positive indication for Early Mortality Syndrome (EMS) or Acute Hepatopancreatic Necrosis Disease (AHPND). Environmental factors such as water temperature, pH, dissolved oxygen, nutrients, organic substances etc. might be the causal factors of these bacterial load variations.

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