General Information

Event name: PT-96-013
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Positive to DSP.)
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 (Since 1987, the first year of confirmed occurrence, the problem has occurred every year, with a break in 1993. This year the most affected areas were Minho estuary, Aveiro Lagoon , Mondego estuary, Obidos Lagoon and Sagres.)
Individuals to contact: SAMPAYO, M¬ Antonia , VILARINHO, M¬ da Graša

Location & Date

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Location: Latitude: , Longitude:
General location information: Sagres.,
HAB Area code(s): PT-06
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1996-07-02, End: 1996-09-18
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis sp. ( 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: 19 °C, Min: 16 °C
Salinity Range During Event: Max: 36, 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
Mytilus edulis Okadaic Acid OA eq LC
Kit used: No Type of kit used:
Additional information: Mostly mussels ( Mytilus edulis ) from these regions presented DSP toxins, in the case of the mussels from Sagres we could not find DSP toxins by HPLC analysis, but the mice died during the first 24 hours after injection, so the harvest was closed in the region. DSP toxins were determined both by the mouse bioassay and through HPLC.
Economic losses:
Management decision: Harvest of affected species closed during toxication.
Additional harmful effect information:
Checked at 05:34 on 22 Feb 2018