General Information

Event name: GB-99-005
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: up to 294 g DA/g)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (FRS Marine Laboratory Aberdeen Shellfish Hygiene monitoring programme.)
Event occurred before in this location: No
Individuals to contact: BRESNAN, Eileen

Location & Date

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Location: Latitude: , Longitude:
General location information: West, East Scotland, Orkney, Scotland
HAB Area code(s): GB-16 GB-17 GB-18 GB-19 GB-20 GB-22
Additional location information: This bloom impacted mulitple regions around the scottish coast. DA levels exceeded the regulatory limits mainly in P. maximus but also in Chlamys opercularis.
Bloom event dates (yyyy/mm/dd): Start: 1999-07-07, End: 2000-03-11
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (200,000 cells/L)
This is the maximum number recorded at one site in this region.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Pecten maximus Domoic Acid DA eq 297 ug/g LC
Chlamys opercularis (gonad) Domoic Acid DA eq 94.04 g/g LC
Mytilus edulis Domoic Acid DA eq 23.13 LC
Kit used: Type of kit used:
Additional information: These three species are from different areas in this widespread bloom
Economic losses:
Management decision: Widespread closures enforced in offshore scallop areas for extended periods of time causing widespread impacts on Scallop fishing community
Additional harmful effect information: See Bresnan et al. (2017) Harmful algae to show very slow depuration rates of DA from Scallop gonads.
Updated at 03:11 on 14 Apr 2018