General Information

Event name: NO-93-002
Country: NORWAY
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: Yes
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: No
Individuals to contact: DAHL, Einar , MARTINUSSEN, Ingrid

Location & Date

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Location: Latitude: , Longitude:
General location information: Byfjorden Bergen., West Coast.
HAB Area code(s): NO-08
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: May.


Causative organism known: Yes
Causative Species/Genus: Chrysochromulina sp. ( cells/L)
Identified in EM by Wenche Eikrem, Oslo Univ.
Co-Ocurring Species/Genus: Skeletonema costatum ( cells/L)
Emiliania huxleyi ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information: Chrysochromulina sp. was mixed up with Chaetoceros wighamii and Skeletonema costatum. A mixed bloom of Emiliana huxleyi and diatoms was going on in adjacent fjords, which were under the influence of the Norwegian coastal current.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): 3 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: 13 °C, Min: 12 °C
Salinity Range During Event: Max: 18, Min: 15
Bloom location in the water column:
In situ
Growth Comments The bloom probably started in a cove with some advection into the fjord.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: The water showed positive synaptosome test when tested for toxicity. Anne Sophie Meldahl, Norwegian Defence Research Establishment, division for Environmental Toxicology.
Economic losses:
Management decision:
Additional harmful effect information:
Updated at 02:35 on 5 Mar 2018