General Information

Event name: LV-99-002
Country: LATVIA
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: Yes (Approximate range: 18-87 mkrg MC-LR /mg DW.)
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (Detected annually from mid-July till September.)
Individuals to contact: BALODE, Maija , PURINA, Ingrida

Location & Date

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Location: Latitude: 57.066667, Longitude: -23.966667
General location information: Estuary zone of River Daugava, Southern part, Gulf of Riga, Latvia.
HAB Area code(s):
Additional location information: ICES fishing area: 28.
Bloom event dates (yyyy/mm/dd): Event Date:1999-09-02
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Detection date: 02/09/99

Microalgae

Causative organism known: Yes
Causative Species/Genus: Microcystis spp. (35,000,000 cells/L)
Detected by light microscopy.
Aphanizomenon flos-aquae (142,400 (1 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Calm, sunny. Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 17 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information: AMONIUM: 4 ÁM/L
NITRATE: 4.78 ÁM/L
PHOSPHATE: 1.44 ÁM/L
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Surface
Growth:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Microcystis spp. Microcystins MC-LR 86.7 mkrg/mgDW LC
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES