Harmful Algal Information System: Event ES-02-009

General Information

Event name:	ES-02-009
Country:	SPAIN
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes (Approximate range: 1.6 - 33.0 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: 42.558333, Longitude: -8.910000
General location information:	Ría de Arousa., Galicia, NW Spain. HAB Area code(s): ES-07
Additional location information:	42º 36.70' - 42º 29.80' N; 08º 49.90' - 08º 55.60' W.
Bloom event dates (yyyy/mm/dd):	Event Date:2002-07-30 Start: 2002-07-30, End: 2002-08-05
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Pseudo-nitzschia australis (864.000 cells/L) 42º 33.50'N, 08º 54.60' W (St. A4) on 30/07/02
Co-Ocurring Species/Genus:	Dactyliosolen fragilissimus (248,820 cells/L) 42º 33.50'N, 08º 54.60' W (St. A4) on 30/07/02 Chaetoceros socialis (71.340 cells/L) Leptocylindrus danicus (36.540 cells/L)
Chlorophyll concentration, if known:	6.11 µg/L Chlª µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather:	Cloudy.	Turbidity (NTU):		Wind direction:	W
Stratified water:	Yes	Oxygen content (nL/L):	4.3 - 6.01	Wind velocity:	40
Temperature (°C):	12 - 15.9	Oxygen saturation %:		Current Direction:
Sechhi disk (m):		Salinity:	35.3 - 35.	Current Velocity:	0

Nutrient information:

Temperature Range During Event:

Max: 18 °C, Min: 11 °C

Salinity Range During Event:

Max: 35, Min: 34

Bloom location in the water column:

Subsurface

Growth:

In situ

Growth Comments

Additional Environmental information:

Data from St. A4. Wind velocity: 40 Km/h

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Raft cultivated mussel (Mytilus galloprovinci	Domoic Acid	DA eq	33.0 µg/g	LC
Razor clam (Ensis ensis)	Domoic Acid	DA eq	30.3 µg/g	LC
Cockles (Cerastoderma edule)	Domoic Acid	DA eq	6.3 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 (twoo weeks maximum). Closures due to the presence of toxicity in molluscs is usual in the area and resource explitation strategies allows to face these closrues without great proble