General Information

Event name: ES-03-006
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 MARIÑO)
Event occurred before in this location: Yes (The DSP episodes caused by Dinohysis acuminata 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: 42.388333, Longitude: -8.761667
General location information: Ría de Muros-Noia, Ría de Pontevedra, Ría de, Galicia, NW Spain.
HAB Area code(s): ES-07 ES-08
Additional location information: 42º 47.76' - 42º 13.70' N; 08º 38.80' - 09º 03.00' W.
Bloom event dates (yyyy/mm/dd): Event Date:2003-04-29
Start: 2003-03-25, End: 2003-06-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (1,560 cells/L)
42º 23.30' N; 08º 45.70' W (St. P9) 29/04/03
Co-Ocurring Species/Genus: Leptocylindrus danicus (961,145 cells/L)
Chaetoceros gracilis (129,946 cells/L)
Pseudo-nitzschia spp. (31,185 cells/L)
Chlorophyll concentration, if known: 3.6 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): Wind velocity: 60
Temperature (°C): 14.9 - 15.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 31.9 - 33. Current Velocity: 0
Nutrient information: AMONIUM: 0.02 µg/L
NITRATE: 0.23 µg/L
NITRITE: 0.20 µg/L
PHOSPHATE: 0.23 µg/L
Temperature Range During Event: Max: 19 °C, Min: 11 °C
Salinity Range During Event: Max: 37, Min: 10
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Wind velocity: 60 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
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 possitive for this specie, infaunal molluscs are precautionary closed in that area, until samples
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.