General Information

Event name: PT-98-015
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 22,6 g DA/g)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (The first detected occurrence of Domoic Acid in bivalves over 20 g/g was in smooth callista (Callista chione) in 1995 at Setubal region, since then, only this year we had got again values over 20 g/g and only twice.)
Individuals to contact: SAMPAYO, M Antonia , VILARINHO, M da Graa

Location & Date

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Location: Latitude: , Longitude:
General location information: Minho Estuary.,
HAB Area code(s): PT-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1998-11-03
Start: 1998-11-03,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (56,190 cells/L)
October 27
Pseudo-nitzschia australis ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Mainly Pseunonitzschia australis.
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: 17 °C, Min: 15 °C
Salinity Range During Event: Max: 35, Min: 32
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments 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 Domoic Acid DA eq 22,6 g/g LC
Kit used: No Type of kit used:
Additional information: ASP toxins were determined by HPLC through Lawrence, 1991 method.
Economic losses:
Management decision: None, as the affected areas and species were already closed due to DSP.
Additional harmful effect information:
Checked at 05:33 on 22 Feb 2018