General Information

Event name: PT-04-002
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 0.4 - 200 g/100g OA equiv.)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Blue mussels, Grooved carpet shells, Surf clams, Carpet shells, Donax clams, Common cockles, Razor clams.
Report the outcome of a monitoring programme: Yes (HAB Monitoring programmme)
Event occurred before in this location: Yes
Individuals to contact: VILARINHO, M da Graa , VALE, Paulo

Location & Date

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Location: Latitude: , Longitude:
General location information: whole coast of Portugal, Mainly NW coast of Portugal
HAB Area code(s): PT-01 PT-02 PT-03 PT-04 PT-05 PT-06 PT-07
Additional location information: 36 30' N - 42N; 7 - 10 W. 600 km of shoreline. Aveiro (peak of D. acuminata on 2 August and peak of D. acuta on 27 September 2004). Blooms detected on July and lasted until November
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July-November several events during the above period with a higher incidence along the NW coast (i.e. between Lisbon /Setbal bays and Porto)


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (4,250 cells/L)
During peak of August 2004 (Aveiro)
Dinophysis acuta (9,500 cells/L)
During peak on September 2004 (Aveiro)
Co-Ocurring Species/Genus: Chaetoceros spp. (3,000 cells/L)
During peak of D. Acuminata
Leptocylindrus danicus (5,000 cells/L)
During peak of D. Acuminata
Proboscia alata (1,500 cells/L)
During peak of D. Acuminata
Prorocentrum micans (17,000 cells/L)
During peak of D. Acuminata
Scrippsiella trochoidea (23,000 cells/L)
During peak of D. Acuminata
Cylindrotheca closterium (8,000 cells/L)
During peak of D. Acuta
Paralia sulcata (22,000 cells/L)
During peak of D. Acuta
Dinophysis dens (350 cells/L)
During peak of D. Acuta
Scrippsiella trochoidea (4,000 cells/L)
During peak of D. Acuta
Chlorophyll concentration, if known: µg/l
Additional bloom information: Paralia sulcata D. dens Scrippsiella trochoidea
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue mussels Okadaic Acid OA eq 156.4 ELISA
Grooved carped shells Okadaic Acid OA eq 55.3 LC-MS
Surf clams Okadaic Acid OA eq 85.8 LC-MS
Carpet shells Okadaic Acid OA eq 68.9 LC-MS
Donax clams Okadaic Acid OA eq 199 LC-MS
Common cockles Okadaic Acid OA eq 88.8 LC-MS
Razor clams Okadaic Acid OA eq 45.5 LC-MS
Kit used: No Type of kit used:
Additional information: Assay for OA and DTX2 recovered after alkaline hydrolisis, either by LC-MS or DSP-check immunoassay Kit. ELISA: OA, DTX2, acyl ester of OA and DTX2.
Economic losses:
Management decision: Close the area to bivalve catch.
Additional harmful effect information: ND (not detected) <0.4 g/100g OA equiv.
Checked at 05:33 on 22 Feb 2018