title: Nutrient and microbial dynamics in eutrophying shrimp ponds affected or unaffected by vibriosis.
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.
authors: IFREMER, LEAD, BP 2059, 98846 Nouméa cedex, New Caledonia. hugues.lemonnier@ifremer.fr
authors: Hugues
authors: H
authors: Lemonnier
authors: Claude
authors: C
authors: Courties
authors: Chantal
authors: C
authors: Mugnier
authors: Jean-Pascal
authors: JP
authors: Torréton
authors: Alain
authors: A
authors: Herbland
mesh_terms: D000818:Animals; D017756:Aquaculture; D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D017753:Ecosystem; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry; D056265:Microbial Interactions; D009584:Nitrogen / Q000032:analysis; D033561:Penaeidae / Q000382:microbiology*; D010758:Phosphorus / Q000032:analysis; D010839:Phytoplankton / Q000254:growth & development; D012623:Seawater / Q000737:chemistry; D014733:Vibrio / Q000254:growth & development / Q000472:pathogenicity
chemical_list: D002734:Chlorophyll; D010758:Phosphorus; D009584:Nitrogen; D000077194:Chlorophyll A