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Please use this identifier to cite or link to this item: http://purl.org/purl/3924

Title: An Investigation into OccasionalWhite Spot Syndrome Virus Outbreak in Traditional Paddy CumPrawn Fields in India
Authors: Hatha, A A M
Mujeeb Rahiman, K M
Deborah, Gnana Selvam
Keywords: White Spot Syndrome Virus
prawn farms
physicochemical parameters
perennial ponds
Poor water exchange
Issue Date: 31-Oct-2011
Publisher: The ScientificWorld Journal
Abstract: A yearlong (September 2009–August 2010) study was undertaken to find out possible reasons for occasional occurrence of White Spot Syndrome Virus (WSSV) outbreak in the traditional prawn farms adjoining Cochin backwaters. Physicochemical and bacteriological parameters of water and sediment from feeder canal and four shrimp farms were monitored on a fortnightly basis. The physicochemical parameters showed variation during the two production cycles and between the farms studied. Dissolved oxygen (DO) content of water fromfeeder canal showed low oxygen levels (as low as 0.8mg/L) throughout the study period. There was no disease outbreak in the perennial ponds. Poor water exchange coupled with nutrient loading from adjacent houses resulted in phytoplankton bloom in shallow seasonal ponds which led to hypoxic conditions in early morning and supersaturation of DO in the afternoon besides considerably high alkaline pH. Ammonia levels were found to be very high in these ponds.WSSV outbreak was encountered twice during the study leading to mass mortalities in the seasonal ponds. The hypoxia and high ammonia content in water and abrupt fluctuations in temperature, salinity and pH might lead to considerable stress in the shrimps triggeringWSSV infection in these traditional ponds
Description: The ScientificWorld Journal Volume 2012, Article ID 340830, 11 pages
URI: http://dyuthi.cusat.ac.in/purl/3924
Appears in Collections:Dr A A M Hatha

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