General Information

Event name: LV-99-001
Country: LATVIA
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
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 1993, from mid-July till September.)
Individuals to contact: BALODE, Maija , PURINA, Ingrida

Location & Date

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Location: Latitude: 57.333333, Longitude: -23.183333
General location information: Mersrags, Eastern part of the Gulf of Riga., Gulf of Riga, Latvia.
HAB Area code(s):
Additional location information: ICES fishing area: 28.
Bloom event dates (yyyy/mm/dd): Event Date:1999-08-04
Start: 1999-08-04,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Detection date: 04/08/99

Microalgae

Causative organism known: Yes
Causative Species/Genus: Nodularia spumigena (105,100 ( cells/L)
Detected by light microscopy.
Co-Ocurring Species/Genus: Anabaena sp. (217,000 cells/L)
217,000 (100 filaments/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information: Nodularia spumigena composed 12.0 g/m3 (95% of the total cyanobacterial biomass and 94% of total phytoplankton biomass; 81 and 80% of the total number of counting units, respectively)
Event-related bibliography:

Environmental Conditions

Weather: Calm, sunny. Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): 5.36 Wind velocity:
Temperature (°C): 23.8 Oxygen saturation %: 98.3 Current Direction:
Sechhi disk (m): Salinity: 4.96 Current Velocity: 0
Nutrient information: AMONIUM: 0.8 M/L
NITRATE: 0.1 M/L
PHOSPHATE: 0.01 M/L
SILICATE: 1.0 M/L
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES