General Information

Event name: GB-90-002
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
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: LAING, I.

Location & Date

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Location: Latitude: , Longitude:
General location information: from Burry inlet/Swansea Bay to Fishguard., ENGLAND AND WALES. SOUTH WALES.
HAB Area code(s): GB-10
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Late August- mid September.


Causative organism known: Yes
Causative Species/Genus: Gymnodinium spp. (10,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Effects possibly due to creation of anoxic conditions.
Event-related bibliography:

Environmental Conditions

Weather: Weather very hot and settled. 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 Mortalities commenced off Pembrokeshire coast and spread eastwards along S. Wales coast during incident.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: Samples of mussels, cockles and lugworm taken for analysis of PSP toxins (mouse bioassay). No PSP toxins detected. Blood samples from worms negative for botulism.
Additional harmful effect information: Secondary blooms of bacteria (Pseudomonads and Vibrios).
Updated at 02:35 on 2 Apr 2018