General Information

Event name: PT-88-005
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (1972 Óbidos Lagoon, 1987 Inside fish ponds at Aveiro Lagoon)
Individuals to contact: SAMPAYO, Mª Antonia

Location & Date

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Location: Latitude: , Longitude:
General location information: Óbidos Lagoon,
HAB Area code(s): PT-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1988-03-30
Start: 1988-03-20, End: 1988-04-06
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Prymnesium parvum (7x10(7) cells/L)
Co-Ocurring Species/Genus: Skeletonema costatum (4x10(7) cells/L)
2x10(6)/l of other little diatoms and small flagellates
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 16.5 °C, Min: 12 °C
Salinity Range During Event: Max: 19, Min: 14.5
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Brownish water discoloration. Dredging of channel to the sea to open the Lagoon which was closed between 13 and 16 of March

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: Mortalities associated with Prymnesim spp blooms at Portuguese coastal zones are alwasy related with salinities lower than 30%
Checked at 05:32 on 22 Feb 2018