General Information

Event name: ES-07-016
Country: SPAIN
Nature of the harmful event:
Water Discoloration , Other ( Fish mortality)
Event directly affected:
Natural Fish
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 (water discoloration)
Individuals to contact: REVIILLA, Marta , Laza-Martinez, Aitor

Location & Date

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Location: Latitude: 43.260556, Longitude: -2.924167
General location information: Nervion River estuary, Basque Country
HAB Area code(s): ES-01
Additional location information: Inner reaches of the estuary, low salinity zone
Bloom event dates (yyyy/mm/dd): Start: 2007-07-16, End: 2007-07-23
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Dead fish Jul 16;Phytoplankton sampled Jul 25


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus: Pfiesteria spp. (380000 cells/L)
Thalassiosira spp. (217000000 cells/L)
small Thalassiosiroid diatoms
Chlorophyll concentration, if known: µg/l
Additional bloom information: Other co-occurring species was the cryptophyte Urgorri complanatus (340000 Cells/L)
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 19-20 Oxygen saturation %: <20 (bottom) Current Direction:
Sechhi disk (m): 1-1.5 Salinity: 5-20 PSU (surface); 30-35 PSU (bottom) Current Velocity:
Nutrient information: AMONIUM: 15-20 uM
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information: Environmental data from July 3. Fish mortality observed on July 16 and phytoplankton sampled on July 23 (only in surface waters).

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:
Created at 09:15 on 15 Dec 2020
Updated at 09:52 on 15 Dec 2020