General Information

Event name: GB-96-004
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1108 g STXeq /100 g.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (PSP previously detected in Shetland, but always below the action level. First record of domoic acid in Scottish waters.)
Individuals to contact: HOWARD, Godfrey , MACDONALD, Elspeth

Location & Date

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Location: Latitude: , Longitude:
General location information: Shetland Islands., Scotland.
HAB Area code(s): GB-21
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Early June - early September.


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. (up to 3,60 cells/L)
in June
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Alexandrium spp. observed from April to August. Cyst survey during winter found relatively high numbers of Alexandrium tamarense cysts in Shetland sediments.
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 Comments Not known.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus edulis Saxitoxins STX eq 1108 ug/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: PSP - first detected on 05/06/96, peaked on 15/07/96 (1108 g/100 g). Toxins still detectable in SW Shetland until early September.
Economic losses:
Management decision:
Additional harmful effect information:
Updated at 09:23 on 9 Oct 2020