| Event name: | NO-91-001 | |
| Country: | NORWAY | |
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Nature of the harmful event: |
High Phyto concentration , Mass mortalities | |
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Event directly affected: |
Aquaculture Fish | |
| 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 (Gyrodinium bloomed in the area in 1966, 1976, 1981, 1982, 1985, 1988, 1990.) | |
| Individuals to contact: | DAHL, Einar | |
| Location: | Latitude: , Longitude: | |
| General location information: |
, SOUTHERN AND SOUTHWESTERN COAST HAB Area code(s): NO-09 NO-10 NO-11 |
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| Additional location information: | ||
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | August-September. | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Gyrodinium sp.
(20,000,000 cells/L)
Gyrodinium cf. Aureolum. |
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | But normally the recording were from some hundred thousands to a few million cells per litre. | |
| Event-related bibliography: | ||
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: 18 °C, Min: 15 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: |
Subsurface |
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| Growth: |
Advected
In situ |
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| Growth Comments | Bloom due to a combination of advected an in situ growth. | |||||||||||||||||||||||||
| Additional Environmental information: | The temperature was mainly within 15-18 ºC in waterbodies with high concentrations of Gyrodinium. The bloom was first recorded as a subsurface population associated to the upper part of the pycnocline, and remained mainly a subsurface bloom. | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | |||||||
| Management decision: | Intensified local algae monitoring. Deep cages did probably save most of the farms in the area from large losses. | ||||||
| Additional harmful effect information: | |||||||
