General Information

Event name: NO-92-002
Country: NORWAY
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Gyrodinium bloomed in the area in 1966, 1976, 1981, 1982, 1985, 1988, 1990, 1991.)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: , SOUTHERN AND SOUTHWESTERN COAST
HAB Area code(s): NO-09 NO-10 NO-11
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: September.


Causative organism known: Yes
Causative Species/Genus: Gyrodinium sp. (10,000,000 cells/L)
Gyrodinium cf. Aureolum.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Gyrodinium cf. aureolum, up to 10-20 million Cells/L were recorded in small patches in the Flekkefjord area, but normally the recording were from some hundred thousands to a few million cells per litre.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 15 °C, Min: 13 °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments Bloom due to a combination of advected and in situ growth.
Additional Environmental information: The temperature was mainly within 13-15 C in waterbodies with high concentrations of Gyrodinium.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: Intensified local algae monitoring. Deep cages did probably save most of the farms in the area from large losses.
Additional harmful effect information:
Updated at 04:06 on 2 Dec 2019