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General Information

Event name: ES-02-006
Country: SPAIN
Nature of the harmful event:
 Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 8.5 - 32.3 µg DA / g)
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 Mariño.)
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 , SALGADO, Covadonga

Location & Date

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Location: Latitude: 42.758333, Longitude: -9.016667
General location information: Ría de Muros-Noia., Galicia, NW Spain.
HAB Area code(s): ES-07
Additional location information: 42º 46.65' - 42º 43.40' N; 08º 56.54' - 09º 03.00' 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:2002-03-26
Start: 2002-03-26, End: 2002-04-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia australis (154,860 cells/L)
42º 45.50' N; 09º 01.00' W (St. M4) on 26/03/02
Co-Ocurring Species/Genus: Detonula pumila (73,080 cells/L)
42º 45.50' N; 09º 01.00' W (St. M4) on 26/03/02
Thalassiosira sp. (17,400 cells/L)
Thalassiosira rotula/gravida
Chaetoceros curvisetus (15,660 cells/L)
Chlorophyll concentration, if known: 2.98 µg/L Chlª. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction: W
Stratified water: Yes Oxygen content (nL/L): 5.7 - 6.3 Wind velocity: 52
Temperature (°C): 13.2 - 13.60 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 33.6 - 35. Current Velocity: 0
Nutrient information: AMONIUM: 0.86-1.0 mg/L
NITRATE: 2.1-4.3 mg/L
NITRITE: 0.40-0.43 mg/L
PHOSPHATE: 0.21-0.26 mg/L
SILICATE: 0-3.63 mg/L
Temperature Range During Event: Max: 14 °C, Min: 13 °C
Salinity Range During Event: Max: 35, Min: 33
Bloom location in the water column: Whole column
Subsurface
Growth:
In situ
Growth Comments
Additional Environmental information: Data from St.M4. Wind velocity: 52 Km/h.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel (Mytilus galloprovincial Domoic Acid DA eq 32.3 µg/g LC
Cockles (Cerastoderma edule) Domoic Acid DA eq 24.5 µg/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