General Information

Event name: ES-02-004
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: DSP positive.)
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 Mario.)
Event occurred before in this location: Yes (The DSP episodes caused by Dinophysis acuminata are a recurrent phenomenom in the Galician Ras 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: 42.340000, Longitude: -8.791667
General location information: Ra de Foz, Ra de Vicedo-Barqueiro, Ra de A, Galicia, NW Spain.
HAB Area code(s): ES-05 ES-06 ES-07 ES-08
Additional location information: 43 44' - 42 08.22' N ; 07 15' - 09 59' 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:2002-09-23
Start: 2002-09-09, End: 2002-11-19
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (18,440 cells/L)
42 20.40' N; 08 47.50' W (St. P8) on 23/09/02
Co-Ocurring Species/Genus: Rhizosolenia alata (62,640 cells/L)
42 20.40' N; 08 47.50' W (St. P8) on 23/09/02
Ceratium fusus (23,760 cells/L)
Leptocylindrus danicus (6,960 cells/L)
Chlorophyll concentration, if known: 3.2 g/L Chl. µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Rainy. Turbidity (NTU): Wind direction: WSW
Stratified water: No Oxygen content (nL/L): 5.9 - 6.7 Wind velocity: 24
Temperature (°C): 16.9 - 17.9 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 34.9 - 35. Current Velocity: 0
Nutrient information: AMONIUM: 0.37 - 0.74 mg/L
NITRITE: 0.03 - 0.12 mg/L
PHOSPHATE: 0.27 - 0.42 mg/L
Temperature Range During Event: Max: 19 °C, Min: 12 °C
Salinity Range During Event: Max: 35, Min: 10
Bloom location in the water column:
Subsurface
Growth: Advected
In situ
Growth Comments
Additional Environmental information: Wind velocity: 24 Km/h.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel (Mytilus galloprovincial Okadaic Acid OA eq g/g Bioassay-Mouse
Wild mussel (Mytilus galloprovincialis) Okadaic Acid OA eq g/g Bioassay-Mouse
Clams (Venerupis rhomboides) Okadaic Acid OA eq g/g Bioassay-Mouse
Clams (Donax trunculus) Okadaic Acid OA eq g/g Bioassay-Mouse
Cockles (Cerastoderma edule) Okadaic Acid OA eq g/g Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: The official 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 assays are possitive 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 explitation strategies allows to face these closures without great problems.
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES