General Information

Event name: NO-87-002
Country: NORWAY
Nature of the harmful event:
Water Discoloration
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: Yes
Event occurred before in this location: Yes (Ceratium furca is a very common species algong the Norwegian coast in late summer and through the autumn. Brownish water due to mass occurrence of this alga happened also in 1986.)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: , SOUTHERN AND WESTERN COAST.
HAB Area code(s): NO-06 NO-07 NO-08 NO-09 NO-10 NO-11
Additional location information: A large scale phenomenon.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: The peak along the coast in August.


Causative organism known: Yes
Causative Species/Genus: Ceratium furca (3,000,000 cells/L)
recorded in brown patches.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments Tthe alga was first numerous in the Skagerrak and was then transported along the cast with the Coastal Current, however, local growth along the coast may have maintained and even increased the algal population along the coast. The patches of brown water a
Additional Environmental information: No data.

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: The results from the algae monitoring programme were transmitted through MARINET, a computer based information system owned by the fish farmers central administration.
Additional harmful effect information:
Updated at 03:30 on 2 Dec 2019