White spot sydrome virus (WSSV) is one of the most important viral disease of shrimp. Several studies to
control the disease have been done. Tank experiments identified WSSV risk factors related to the physico
chemical properties of the water. A few studies reported pond level WSSV risk factors. This study identifies the
risk factors associated with essentially two different farming systems: polyculture and semi-intensive
monoculture of Penaeus monodon. Data were gathered from a total of 174 shrimp farmers in eight provinces of
the Philippines using a structured questionnaire. Forty-seven variables related to pond history and site
description, period of culture, pond preparation techniques, water management, culture methods, feed and
other inputs, and biosecurity measures were investigated. In the analysis for combined monoculture and
polyculture farms, feeding live molluscs was identified as important WSSV risk factors. In addition to feeding
live molluscs, sharing of water source with other farms, having the same receiving and water source, larger
pond size, and higher stocking density were identified as important WSSV risk factors in monoculture farms.
Climate, i.e. stocking during the cold months and sludge removal and its deposition on the dikes were
identified as WSSV risk factors in polyculture farms. Protective factors, listed in decreasing significance, were
feeding with planktons and high mangrove to pond area ratio, both observed in the dataset with both
monoculture and polyculture farms, while only the latter was observed in the dataset for monoculture farms
only. No protective factor was observed in the dataset for polyculture farms.
This study confirmed the negative effect of sharing water source with other farms and identified several new
factors influencing WSSV infection such as feeding live molluscs increases the risk, while feeding with
planktons and high mangrove to pond area ratio reduce the risk.
White spot sydrome virus (WSSV) is one of the most important viral disease of shrimp. Several studies tocontrol the disease have been done. Tank experiments identified WSSV risk factors related to the physicochemical properties of the water. A few studies reported pond level WSSV risk factors. This study identifies therisk factors associated with essentially two different farming systems: polyculture and semi-intensivemonoculture of Penaeus monodon. Data were gathered from a total of 174 shrimp farmers in eight provinces ofthe Philippines using a structured questionnaire. Forty-seven variables related to pond history and sitedescription, period of culture, pond preparation techniques, water management, culture methods, feed andother inputs, and biosecurity measures were investigated. In the analysis for combined monoculture andpolyculture farms, feeding live molluscs was identified as important WSSV risk factors. In addition to feedinglive molluscs, sharing of water source with other farms, having the same receiving and water source, largerpond size, and higher stocking density were identified as important WSSV risk factors in monoculture farms.Climate, i.e. stocking during the cold months and sludge removal and its deposition on the dikes wereidentified as WSSV risk factors in polyculture farms. Protective factors, listed in decreasing significance, werefeeding with planktons and high mangrove to pond area ratio, both observed in the dataset with bothmonoculture and polyculture farms, while only the latter was observed in the dataset for monoculture farms
only. No protective factor was observed in the dataset for polyculture farms.
This study confirmed the negative effect of sharing water source with other farms and identified several new
factors influencing WSSV infection such as feeding live molluscs increases the risk, while feeding with
planktons and high mangrove to pond area ratio reduce the risk.
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