General Information

Event name: ES-89-004
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: > 80 µg 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: No
Individuals to contact: BRAVO, Isabel , REGUERA, Beatriz

Location & Date

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Location: Latitude: , Longitude:
General location information: Rķas Bajas Gallegas., Galicia, NW Spain.
HAB Area code(s): ES-07 ES-08
Additional location information: Vigo, Pontevedra, Arosa and Muros.
Bloom event dates (yyyy/mm/dd): Event Date:1989-10-26
Start: 1989-08-08, End: 1989-12-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Autumn


Causative organism known: Yes
Causative Species/Genus: Gymnodinium catenatum (4,800 cells/L)
October 26. Observed from 8 August to 13 December in Vigo
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Sampling was carried out with a hose-sampler (recommended by I.C.E.S., WG of 1986) at 0-5, 5-10 and 10-15 m.
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: 35 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 16 °C, Min: 15 °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments It is suggested that G. catenatum in this season is introduced into the rias when upwelling ceases and offshore surface waters are pushed onshore by the southerly winds.
Additional Environmental information: At the beginning of the season the stratification varied depending on upwelling pulses. The water column was almost isothermal since the second half of October.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mussels (November) Saxitoxins STX eq > 80 Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Collection and sale of molluscs was forbidden
Additional harmful effect information: PSP detected in mussels cultivated in rafts.