National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
In recent years, a number of diseases have been negatively effecting on shrimp aquaculture. More recently, Enterocytozoon hepatopenaei (EHP), a microsporidian parasite causes Hepatopancreatic Microsporidiosis (HPM) to be associated with white feces syndrome (WFS) and slow (retarded or stunted) growth in farmed L. vannamei (pacific white leg shrimp) in many of the shrimp growing countries in Asia, also in India. Numerous studies revealed that the pathogen causing significant economic losses to the shrimp industry. So, to evaluate the economical importance of this parasite on pond profitability, five (5) farm pond production effected by both EHP and white feces syndrome were compared with five (5) normally performed shrimp population with biosecured environment by adopting best management practices (BMPs). Important diagnoses observed were histopathological studies and molecular technique (PCR). Histologically, EHP infected animals showed severe degeneration of hepaotopancreatic tubule, basophilic inclusions resembling the developmental stages of EHP were found in the epithelial cells and large number of spore aggregations was observed in the tubular lumen. EHP infected ponds have poor performance in average daily growth (ADG), days of culture (DOC), average body weight (ABW), feed conversion ratio (FCR) and shrimp biomass compared to normal healthy ponds. The shrimp population in EHP infected ponds having white feces syndrome (WFS) showed FCR of over 2.92 to 3.17 (can be considered as 3.0) where as normal growth ponds showed FCR of 1.83 to 1.94 (can be considered as 1.9). The portal route of entry of pathogen into shrimp was evaluated by performing oral feed bioassay, it was revealed that EHP can be transmitted through per os feeding of EHP infected hepatopancreas tissue to healthy shrimp. This is the first report to evaluate the economic importance of EHP on pond profitability.
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