General Information

Event name: NO-01-001
Country: NORWAY
Nature of the harmful event:
Mass mortalities
Event directly affected:
Aquaculture Fish
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 (bloom in 1998, present in 2000.)
Individuals to contact: NAUSTVOLL, Lars-Johan

Location & Date

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Location: Latitude: , Longitude:
General location information: Skagerrak, Flødevigen.,
HAB Area code(s): NO-11
Additional location information: The bloom was obseved along the Swedish west-coast and the southern coast of Norway, from Oslofjord to Lista. ICES fishing area: II a.
Bloom event dates (yyyy/mm/dd): Start: 2001-03-14, End: 2001-03-26
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: The bloom started in Norwegian waters (Flødevigen) ca 14.03.01 with a maximum concentration around 26.03.01. The bloom was terminated in the beginning of april.


Causative organism known: Yes
Causative Species/Genus: Chattonella sp. (13,7 x (10 cells/L)
Chattonella cf. Marina
Co-Ocurring Species/Genus: Heterosigma akashiwo (13 million cells/L)
Chlorophyll concentration, if known: 11.4 µg/L Chlª. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 1-3 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 22-28 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments
Additional Environmental information: Phosphate and nitrate were exausted while there were some silicate left in the surface.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: No toxins were recorded neither from mouse-bioassay, Elisa-methods or application of LC/MS. Materials screened for toxin content were: phytoplankton collected by filtration, mussel meat and fish meat.
Economic losses: 1000 tonnes of salmon.
Management decision:
Additional harmful effect information:
Updated at 03:07 on 5 Mar 2018