General Information

Event name: GB-94-002
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 8,982 units.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (Regular occurrence every year since 1968 in Forth.)
Individuals to contact: HOWARD, Godfrey , MACDONALD, Elspeth

Location & Date

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Location: Latitude: , Longitude:
General location information: Scotland and North East England, East Coast.
HAB Area code(s): GB-01 GB-02 GB-22 GB-23
Additional location information: PSP toxins were detected in mussel samples over an area extending from Wick to Staithes NE England. PSP toxins were also found in scallops from the Moray Firth Scallop Grounds. Offshore scallops from Bellrock to Montrose were also affected.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Toxins detected between: Mussels (Mytilis edulis): Mid-May - End June. Scallops (Pecten maximus): End May - Early August. Low levels of toxins detected between: Brown crab (Cancer pagurus): Mid-June (peak 468 units) Lobster (Homarus gammarus): Early June (peak 450 units)


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: No water samples were analysed. A new phytoplankton monitoring programme is being set up next year.
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: No information available.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mussels Saxitoxins 317 ug/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: The Dornoch Firth Fishery was subject to a voluntary closure agreement first for PSP and then for DSP, the closure lasting until the 25th of July. Scallop fishing vessels working around the Bellrock area were lower and scallop processors were required to
Additional harmful effect information: Toxins levels in mussels first appeared in the Berwick area in mid-May and by early June had peaked at 8982 units, then fell to below 400 units by the end of the month at Elie in the Firth of Forth, an area where high levels in previous years were regular
Updated at 09:45 on 9 Oct 2020