General Information

Event name: ES-00-010
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 2.7 - 66.7 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 Mari˝o.)
Event occurred before in this location: Yes (Detected annually from 1995; generally with a periodicity of two events a year: at the beginning - middle of spring and autumn.)
Individuals to contact: MANEIRO, Juan , PAZOS, Yolanda , MOROĐO, ┴ngeles

Location & Date

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Location: Latitude: 42.181667, Longitude: -8.719333
General location information: RÝa de Vigo., Galicia, NW Spain.
HAB Area code(s): ES-08
Additional location information: 42║ 10.90' - 42║ 14.36' N ; 08║ 43.16' - 08║ 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:2000-04-18
Start: 2000-07-17, End: 2000-07-31
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 (509,820 cells/L)
Determined by electronic microscopy. Other species from the same genera are present in low concentrations. Determined by electronic microscopy. Other species from the same genera are present in low concentrations.
Co-Ocurring Species/Genus: Chaetoceros spp. (725,333 cells/L)
And other chain-forming diatoms.
Chlorophyll concentration, if known: 2.7 Ág/L Chl¬. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Cloudy. Turbidity (NTU): Wind direction: SSW
Stratified water: No Oxygen content (nL/L): Wind velocity: 50
Temperature (°C): 16 (0m); 13.5 ( Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 35.5 (0m); Current Velocity: 0
Nutrient information: AMONIUM: 0.13 Ámol/L
NITRATE: 0.30 Ámol/L
NITRITE: 0.08 Ámol/L
PHOSPHATE: 0.34 Ámol/L
Temperature Range During Event: Max: 16 °C, Min: 13 °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 V5. Ria de Vigo 24/7/00. Wind velocity: 50 m/s.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel (Mytilus galloprovincial Domoic Acid DA eq 66.7 ppm LC
Benthic shellfish Domoic Acid DA eq LC
Kit used: No Type of kit used:
Additional information: AOAC Official Method, 1998 991.26, Domoic Acid in Mussels. Liquid Chromatographic Method.
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: 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 the area and resource exploitation strategies allows to face these closures without great proble