| Event name: | NO-91-004 | |
| Country: | NORWAY | |
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Nature of the harmful event: |
Mass mortalities | |
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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: | No | |
| Individuals to contact: | AURE, Jan , REY, Francisco | |
| Location: | Latitude: , Longitude: | |
| General location information: |
The inner part of Vestfjorden., NORTHERN COAST. HAB Area code(s): NO-04 |
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| Additional location information: | ||
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | From ca. 16 May to mid June. | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Chrysochromulina leadbeateri
(2,000,000 cells/L)
Identified by electron microscopy. |
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | Identified by electron microscopy in fresh material by Jahn Throndsen and Wenche Eikrem, University of Oslo. Highest observed concentration of about 9 million cells per litre. Most usual observed concentration range: 2-3 million cells per litre. | |
| Event-related bibliography: | Rey, F. (1991) (Ed.) The Chrysochromulina leadbeateri bloom in Vestfjorden, North Norway, May-June 1991. Fisken Hav., 1991 (3), 122 p. (In Norwegian with English abstract). | |
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: 7 °C, Min: 5 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | Max: 31, Min: 32 | |||||||||||||||||||||||||
| Bloom location in the water column: |
Surface |
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| Growth: |
In situ |
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| Growth Comments | The bloom seemed to have produced locally inside the fjords limiting with Vestfjorden. | |||||||||||||||||||||||||
| Additional Environmental information: | At the end of the bloom the water temperature increased to 7-9 ºC. Mainly observed in an upper stratified layer. | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | |||||||
| Management decision: | Intensive algal monitoring from Monday 27 May and until mid-June. Due to risks of disease spreading the cages were not moved to less affected areas. Pumping of deep water helped in some cases to reduce mortality. | ||||||
| Additional harmful effect information: | |||||||
