General Information

Event name: ES-02-002
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
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 Dinophysis acuminata are a recurrent phenomenom in the Galician Rías with more or less incidence depending on the year.)
Individuals to contact: MANEIRO, Juan , PAZOS, Yolanda , SALGADO, Covadonga

Location & Date

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Location: Latitude: 42.181667, Longitude: -8.868333
General location information: Estuary of Muros in Ría de Muros-Noia, Outer, Galicia, NW Spain.
HAB Area code(s): ES-07
Additional location information: 42º 46.65' - 42º 08.22' N; 08º 42.30' - 08º 58.80' W. The affected area is dedicates 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:2002-05-27
Start: 2002-05-20, End: 2002-07-02
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (4,440 cells/L)
42º 10.90' N - 08º 52.10' W (St. V5) on 27/05/02
Co-Ocurring Species/Genus: Leptocylindrus danicus (375840 cells/L)
42º 10.90' N; 08º 52.10' W (St. V5) on 27/05/02
Chaetoceros spp. (375,840 cells/L)
Cylindrotheca closterium (10,440 cells/L)
Chlorophyll concentration, if known: 1.9 µg/L Chlª. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Rainy Turbidity (NTU): Wind direction: WSW
Stratified water: Yes Oxygen content (nL/L): 5.0-6.0 Wind velocity: 27
Temperature (°C): 13.4-15.7 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 34.5-35.6 Current Velocity: 0
Nutrient information: AMONIUM: 0.40-1.7 mg/l
NITRATE: 0.48-1.48 mg/l
NITRITE: 0.15-0.18 mg/l
PHOSPHATE: 0.17-0.32 mg/l
Temperature Range During Event: Max: 17 °C, Min: 12 °C
Salinity Range During Event: Max: 35, Min: 32
Bloom location in the water column:
Growth: Advected
Growth Comments
Additional Environmental information: Wind velocity: 27 Km/h.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel (Mytilus galloprovincial Okadaic Acid Positive Bioassay-Mouse
Okadaic Acid OA eq 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. Wild mussels (Mytilus galloprovincialis) are used as bioindicator for infaunal molluscs, then when assay are positive for this species, infaunal molluscs are closed in that area.
Additional harmful effect information: Closures due to the presence of toxicity in molluscs is usual in the area and resource exploitation strategies alow to face these closures without great problems.