General Information

Event name: ES-21-025
Country: SPAIN
Nature of the harmful event:
Other ( complaints (skin problems) by beach users coinciding with a Ostreopsis spp. bloom)
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (fewer people previously affected)
Individuals to contact: Laza-Martinez, Aitor

Location & Date

[View larger map]
Location: Latitude: 43.318889, Longitude: -1.996111
General location information: Donostia-San Sebastián, Basque Country
HAB Area code(s): ES-01
Additional location information: Beach area
Bloom event dates (yyyy/mm/dd): Event Date:2021-09-07
End: 2021-10-08
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: the start of the bloom was not recorded


Causative organism known: Yes
Causative Species/Genus: Ostreopsis spp. (1900 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: max. epiphytic concentration: 475465 cells/g FW macroalga. BOth O. cf. siamensis and O. cf. ovata isolated
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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information:

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: bathing with caution (yellow flag) was recommended
Additional harmful effect information: 163 cases of pruritus were reported to the lifeguard services on the beaches of Donostia. Three of the cases required medical attention: two were mild and the other required further monitoring as it presented with rhinoconjunctivitis, cough and fever
Created at 03:43 on 24 May 2022