General Information

Event name: PT-96-035
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (At Albufera Lagoon some years when the opening to the sea closes there are eutrophization. Some years ago also in aquaculture ponds at Algarve we could relate fauna mortalities with the occurrence of Heterosigma inlandica.)
Individuals to contact: SAMPAYO, M¬ Antonia , VILARINHO, M¬ da Graša

Location & Date

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Location: Latitude: , Longitude:
General location information: Formosa Lagoon., Algarve.
HAB Area code(s): PT-07
Additional location information: Fish ponds at Fuzeta.
Bloom event dates (yyyy/mm/dd): Start: 1996-08-05, End: 1996-08-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Heterosigma inlandica (3,300,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Total phytoplankton 17,500,000
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: 28 °C, Min: 22 °C
Salinity Range During Event: Max: 40, Min: 37
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments Advected seed population with high in situ growth.
Additional Environmental information: Oxygen: anoxia at critical time (05-08 hours).

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: In the case of fish ponds to change the water in the affected ponds as fast as possible.
Additional harmful effect information: