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  • Title: Nutrient and microbial dynamics in eutrophying shrimp ponds affected or unaffected by vibriosis.
    Author: Lemonnier H, Courties C, Mugnier C, Torréton JP, Herbland A.
    Journal: Mar Pollut Bull; 2010 Mar; 60(3):402-11. PubMed ID: 19939413.
    Abstract:
    A field survey was conducted on two intensive shrimp farms using similar technical practices: one (DF) historically affected by a vibriosis, the other (HC) in which the pathogen has been observed although no mortality event has occurred. Because historical data suggest that eutrophication process may directly or indirectly play a role in the disease outbreak, we focussed our research on its dynamics. A higher variability of the phytoplanktonic compartment linked to an imbalance in the molar N:P ratio was observed in farm DF compared to farm HC, implying a modification on the linkage between the bacteria and phytoplankton compartments at DF. The beginning of the mortality outbreak at DF followed a shift from pico- to nanophytoplankton. The organic matter mineralization process at the water-sediment interface may explain the disturbance observed in the water column during eutrophication. The consequences of this disturbance on shrimps' health status and pathogen ecology are discussed.
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