General Information

Event name: ES-21-022
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 157 - 1252 µg OA eq./kg)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (annually in spring)
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): Event Date:2021-05-19
Quarantine levels dates (yyyy/mm/dd): First detection: 2021-04-19, End: 2021-06-21
Additional date-related information: Another bloom in April (ES-21-021)


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (1460 cells/L)
Max. 2021-05-19, at 0-10 m; from 10 to 30 m <100 cells/L (hose)
Co-Ocurring Species/Genus: Phalacroma rotundatum (Claparéde & Lachmann) Kofoid & Michener, 1911 (20 cells/L)
2021-05-19, 10-20 m (hose)
Dinophysis acuta (20 cells/L)
2021-05-19, 10-20 m (hose)
Chlorophyll concentration, if known: 0.5 (maximum, at 25 m) µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: March and April little rain Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 13.5-14.2 Oxygen saturation %: Current Direction:
Sechhi disk (m): 19 Salinity: 34.9-35.2 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 14.2 °C, Min: 13.5 °C
Salinity Range During Event: Max: 35.2, Min: 34.9
Bloom location in the water column:
Growth Comments
Additional Environmental information: Chl-a and hydrographic data are from 2 weeks before the bloom (2019-05-03) and refer to the water column (0-30 m). D. acuminata was already present (100-200 cells/L).

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus galloprovincialis Okadaic Acid OA 1252 ug OA eq./kg LC-MS
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Closure of the bivalves production zone from 2021-04-19 to 2021-07-01
Additional harmful effect information:
Created at 11:24 on 9 May 2022
Updated at 12:28 on 9 May 2022