Harmful Algal Information System: Event ES-01-010

General Information

Event name:	ES-01-010
Country:	SPAIN
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes (Approximate range: 2.25 µg OA/g)
Associated syndrome:	DSP
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 (The DSP episodes caused by Dinohysis are a recurrent phenomenom in the Galician Rías whith more or less incidence depending on the year.)
Individuals to contact:	MANEIRO, Juan , PAZOS, Yolanda , MOROÑO, Ángeles

Location & Date

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Location:	Latitude: 42.181667, Longitude: -8.409167
General location information:	Rías Baixas (Vigo, Pontevedra, Arousa and Mur, Galicia, NW Spain. HAB Area code(s): ES-05 ES-07 ES-08
Additional location information:	42º 10.90' - 43º 24. 55' N; 8º 41.11 - 9º 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:2001-10-08 Start: 2001-09-04, End: 2001-11-17
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	Detection of quarantine levels: from 27/08/01 to 5/11/01

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Dinophysis acuminata (2,800 cells/L) Dinophysis acuta (2,960 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	16.19 µg/L Chlª. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather:		Turbidity (NTU):		Wind direction:
Stratified water:	Yes	Oxygen content (nL/L):	5.07	Wind velocity:	29
Temperature (°C):	19.29	Oxygen saturation %:		Current Direction:
Sechhi disk (m):		Salinity:	34.79	Current Velocity:	0

Nutrient information:

AMONIUM: 1.06 µg/L
NITRATE: 0 µg/L
NITRITE: 0.78 µg/L
PHOSPHATE: 0.74 µg/L
SILICATE: 1.86 µg/L

Temperature Range During Event:

Max: 22 °C, Min: 12 °C

Salinity Range During Event:

Max: 36, Min: 17

Bloom location in the water column:

Subsurface

Growth:

Advected

Growth Comments

Additional Environmental information:

Wind direction: 299º. Wind velocity: 29 Km/h. Oceanographic conditions and phytoplankton data presented are those at the maximum Dinophysis cell concentration but as the bloom was temporally and spatial very extensive, the general conditions were very wi

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Raft cultured mussel (Mytilus galloprovincial	Okadaic Acid	OA eq	2.25 µg/g	LC
Infaunal bivalves from wild banks	Okadaic Acid	OA eq	2.25 µg/g	LC

Kit used: No

Type of kit used:

Additional information:

The oficial detection method is by mouse bioassay: Yasumoto et al., Seafood toxins, 1984, 207-214.Some samples are analyzed by HPLC: Lee et al., Agric. Biol. Chem., 1987, 51, 877.

Economic losses:

Not evaluated

Management decision:

Harvesting was closed in culture areas affected.

Additional harmful effect information:

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 problems.