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General Information

Event name: US-24-020
Country: UNITED STATES
Nature of the harmful event:
 Water Discoloration
Event directly affected:
 Humans
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity:
Species implicated in toxin transmission (transvector): respiratory symptoms developed after each of two surfing exposures during the active bloom. L. polyedra blooms occur periodically off the Southern California coast and are known to be associated with respiratory symptoms in people exposed
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (L. polyedra blooms have occurred previously off the Southern California coast. A particularly large event with mass fish/invertebrate mortality in Spring 2020 - Red Tide Bulletin: Spring 2020 | Southern California Coastal Ocean Observing System; https://sccoos.org/california-hab-bulletin/red-tide/)
Individuals to contact: MURPHY, Shannon

Location & Date

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Location: Latitude: , Longitude:
General location information: California- San Diego County,
HAB Area code(s): US-19
Additional location information: Scripps Institute of Oceanography routinely monitors for phytoplankton populations off the San Diego coast and detected a dinoflagellate "red tide" bloom (Lingulodinium polyedra) emerging on 4/22/24. The bloom persisted through early June.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known: Yes
Causative Species/Genus: Lingulodinium polyedra ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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:
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:
Additional harmful effect information:
Created at 10:02 on 10 Apr 2025
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