General Information

Event name: ES-00-011
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 2.7-80.3 ppm DA.)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Monitoring Programme of the Centro de Control da Calidade do Medio Mariño)
Event occurred before in this location: No
Individuals to contact: MANEIRO, Juan , PAZOS, Yolanda , MOROÑO, Ángeles

Location & Date

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Location: Latitude: 42.181667, Longitude: -8.719333
General location information: Rías de Vigo y Pontevedra (Aldán)., Galicia, NW Spain.
HAB Area code(s): ES-08
Additional location information: 42º 10.90' - 42º 16.92' N; 8º 43.16' - 8º 52.20' W. The affected area is dedicated to intensive mussel cultivation in rafts and to a high production of other molluscs in natural banks: clams, cockles, oyster and scallops are the main species exploited.
Bloom event dates (yyyy/mm/dd): Event Date:2000-07-24
Start: 2000-10-09, End: 2000-10-30
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Initial and final event dates are approximate, because before and after the event, toxic cells are present in the water in low concentrations, and toxicity in molluscs is in undetectable levels.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia australis (704,700 cells/L)
Determined by electronic microscopy. Other species form the same genera ar present in low concentrations.
Co-Ocurring Species/Genus: Chaetoceros spp. (113,100 cells/L)
and other chain-forming diatoms
Chlorophyll concentration, if known: 7.0 µg/L Chlª. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Rainy. Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity: 37
Temperature (°C): 14.9 (0m); 14. Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 35.4 (0m); Current Velocity: 0
Nutrient information: AMONIUM: 0.55 µmol/L
NITRATE: 1.65 µmol/L
NITRITE: 0.16 µmol/L
PHOSPHATE: 0.33 µmol/L
SILICATE: 0.10 µmol/L
Temperature Range During Event: Max: 14 °C, Min: 14 °C
Salinity Range During Event: Max: 35, Min: 35
Bloom location in the water column:
Growth: Advected
Growth Comments
Additional Environmental information: Data are the average value for the water column (0-15 m). Stn P1. Ria de Aldan 17/10/00. Wind velocity: 37 m/s. Wind direction: variable.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel (Mytilus galloprovincial Domoic Acid DA eq 80.3 ppm LC
Benthic shellfish Domoic Acid DA eq LC
Kit used: No Type of kit used:
Additional information:
Economic losses: Not evaluated.
Management decision: Harvesting was closed in culture areas when domoic acid concentrations was greater than 20 ppm.
Additional harmful effect information: AOAC Official Method, 1998 991.26, Domoic Acid in Mussels. Liquid Chromatographic Method. Irrelevant effects, because the closures caused by this event were brief (two weeks maximum). Closures due to the presence of toxicity in molluscs is usual in