General Information

Event name: ES-21-024
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 0.70 - 4.20 mg YTX eq./kg)
Associated syndrome: OTHER
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (May-June 2021 (ES-21-023))
Individuals to contact: REVIILLA, Marta , SOLAUN, Oihana

Location & Date

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Location: Latitude: 43.356667, Longitude: -2.448056
General location information: Longline Mendexa, Basque Country
HAB Area code(s): ES-01
Additional location information: Open marine waters
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2021-10-13, End: 2021-10-29
Additional date-related information:


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 0.9 (maximum, at 17 m) µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: September warmer than usual; October little rain. Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 15.8-16.9 Oxygen saturation %: Current Direction:
Sechhi disk (m): 11 Salinity: 35.1-35.3 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information: Chl-a and hydrographic data refer to the water column (0-30 m), on 2021-10-25.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus galloprovincialis Yessotoxins YTX 2.7 mg YTX eq./kg LC-MS
Mytilus galloprovincialis Yessotoxins 45-OHYTX 1.5 mg YTX LC-MS
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Closure of the bivalves production zone from 2021-10-13 to 2021-11-15
Additional harmful effect information:
Created at 12:03 on 9 May 2022
Updated at 07:55 on 20 Mar 2023