General Information

Event name: NO-91-003
Country: NORWAY
Nature of the harmful event:
High Phyto concentration , 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 (Same area and same time in 1989 and 1990.)
Individuals to contact: AKSNES, Dag L.

Location & Date

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Location: Latitude: , Longitude:
General location information: Ryfylkefjordene., SOUTHWESTERN COAST.
HAB Area code(s): NO-09
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July-August 91.


Causative organism known: Yes
Causative Species/Genus: Prymnesium parvum (100,000,00 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Gobiusculus flavescens died in less than one hour when exposed to concentrations of 4-6 mill cells/L.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 20 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 5 Current Velocity: 0
Nutrient information: PHOSPHATE: weak enrichment in early bloom
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
In situ
Growth Comments Bloom was extremely local. Some advection within the fjord-system was observed.
Additional Environmental information: Water exchange was restricted, weak phosphate enrichment was observed during early bloom, extreme P-limitation was observed during late bloom.

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: Bloom was expected, and both monitoring and research were conducted before, during and after the bloom.
Additional harmful effect information:
Updated at 02:31 on 5 Mar 2018