General Information

Event name: NO-95-006
Country: NORWAY
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Aquaculture Fish
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: Yes (A harmful bloom of Chrysochromulina polylepis occurred in May 1988, Since then monitoring has revealed regular occurrence, about 1 000 000 cells/L, of Chrysochromulina spp. Each year in May-June, and as much as 6 000 000 cells/L in 1994,)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: Skagerrak Coast.,
HAB Area code(s): NO-11
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: May-June.


Causative organism known: Yes
Causative Species/Genus: Chrysochromulina spp. (5,500,000 cells/L)
in Flodevingen
Chrysochromulina polylepis ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: It was a mixed bloom of Chrysochromulina spp. Up to 5 500 000 cells/L recorded in the Flodevigen, among them C. polylepis.
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: Advected
Growth Comments The algae seemed to follow the Norwegian Coastal current.
Additional Environmental information: The bloom was found in the upper 10 m of the water column.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: Slightly toxic to Artemia salina in a bio-test.
Economic losses:
Management decision: Intesivation of monitoring activity.
Additional harmful effect information:
Updated at 03:01 on 5 Mar 2018