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Nutrient and microbial dynamics in eutrophying shrimp ponds affected or unaffected by vibriosis |
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| Authors: | Hugues Lemonnier Claude Courties Chantal Mugnier Alain Herbland |
| Institution: | a IFREMER, LEAD, BP 2059, 98846 Nouméa cedex, New Caledonia b UPMC Univ. Paris 06, FRE 3247, MBCE, Observatoire Océanologique, F-66651, Banyuls/mer, France c CNRS, FRE 3247, MBCE, Observatoire Océanologique, F-66651, Banyuls/mer, France d IRD UR103-ECOLAG/UMR 5119, Université Montpellier II, CC 093, 34095 Montpellier Cedex 05, France |
| 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. |
| Keywords: | Aquaculture Shrimp Eutrophication Ecosystem shift Phytoplankton Vibriosis |
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