General Information

Event name: ES-03-011
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 75.8 g/g 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 DO MEDIO MARIO)
Event occurred before in this location: Yes (Detected annualy 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 , MOROO, ngeles

Location & Date

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Location: Latitude: 42.266667, Longitude: -8.719333
General location information: Ra de Vigo., Galicia, NW Spain.
HAB Area code(s): ES-08
Additional location information: 42 17.50' - 42 10.90' N; 08 38.80' - 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:2003-07-21
Start: 2003-07-22, End: 2003-07-30
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia australis (493,020 cells/L)
42 16.00' N; 08 43.16' W (St. V2) 21/07/03
Pseudo-nitzschia multiseries ( cells/L)
Co-Ocurring Species/Genus: Pseudo-nitzschia delicatissima (2,619,894 cells/L)
Leptocylindrus danicus (54,945 cells/L)
Rhizosolenia alata (40,095 cells/L)
Chlorophyll concentration, if known: 5.9 g/L Chl. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity: 23
Temperature (°C): 15.5 - 19.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 34.8 - 35. Current Velocity: 0
Nutrient information: AMONIUM: 0.94 g/L
NITRATE: 1.19 g/L
NITRITE: 0.39 g/L
Temperature Range During Event: Max: 20 °C, Min: 12 °C
Salinity Range During Event: Max: 35, Min: 31
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information: Wind velocity: 23 Km/h.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Cockles (Cerastoderma edule) Domoic Acid DA eq 41.0 g/g LC
Clams Domoic Acid DA eq 75.8 g/g 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