General Information

Event name: PT-92-007
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
Event occurred before in this location: Yes (In Portugal since 1987, the year of the first confirmed occurrence, every year until 1992 we are having the problem. This year the affected areas were reduced not only in space but also in the duration of toxication. Aveiro Rias is always the most affected area.)
Individuals to contact: SAMPAYO, M¬ Antonia , VILARINHO, M¬ da Graša

Location & Date

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Location: Latitude: , Longitude:
General location information: Aveiro ria.,
HAB Area code(s): PT-02
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 15 June-30 June & 8 August-12 October.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuta (6,300 cells/L)
Dinophysis sp. (1,100 cells/L)
Dinophysis cf. Acuminata
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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: 18 °C, Min: 15 °C
Salinity Range During Event: Max: 35, Min: 24
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments Most probably a combination of both.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus edulis Okadaic Acid Positive Bioassay-Mouse
Cerastoderma edule Okadaic Acid Positive Bioassay-Mouse
Mytilus edulis Okadaic Acid Positive Bioassay-Mouse
Cerastoderma edule Okadaic Acid Positive Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Mouse biossay following Yasumoto 84, was used to determine toxification.
Economic losses:
Management decision: Harvest of affected species closed during toxification.
Additional harmful effect information: Most of the bivalves from these regions presented DSP toxins: Aveiro ria: Mytilus edulis and Cerastoderma edule The Mouse bioassay, following Yasumoto method, 1984, was used to determine toxification.
Checked at 05:36 on 22 Feb 2018