| Event name: | NO-93-001 | |
| Country: | NORWAY | |
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Nature of the harmful event: |
Mass mortalities | |
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Event directly affected: |
Aquaculture Fish | |
| Toxicity detected: | Yes | |
| 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 (Bloom occurred in 1989, 1990, 1991 and 1992.) | |
| Individuals to contact: | DAHL, Einar , MARTINUSSEN, Ingrid | |
| Location: | Latitude: , Longitude: | |
| General location information: |
Ryfylkefjordene (near Stavanger)., SOUTH WEST COAST. HAB Area code(s): NO-09 |
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| Additional location information: | ||
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | Late June - August. | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Prymnesium sp.
(2,500,000 cells/L)
Prymnesium cf. Parvum |
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | ||
| Event-related bibliography: | ||
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: 15 °C, Min: 10 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: | ||||||||||||||||||||||||||
| Growth Comments | The bloom was first located in the inner parts of the fjord system. Some advection of algae and especially toxic flakes are observed throughout the fjord system. | |||||||||||||||||||||||||
| Additional Environmental information: | In the most intensive blooms period the temperature range 13-15º C. | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | |||||||
| Management decision: | Fish farms in the danger zones escaped the area. | ||||||
| Additional harmful effect information: | To verify toxicity of the algae, test-cages of salmon were placed on different locations in the fjord-system. To detect floating toxic flakes an open well-boat with salmon was tracked in the fjord system. When entering toxic water the fish biked over. Mos | ||||||
