General Information

Event name: KR-04-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Natural Fish , Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (NFRDI/Korea-HAB monitoring program)
Event occurred before in this location: Yes (This bloom has been initiated in this area in August since 1995.)
Individuals to contact: Kang, Y.S.

Location & Date

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Location: Latitude: 34.000000, Longitude:
General location information: Jeonnam province, Yeosu
HAB Area code(s): KR-04
Additional location information: patch with 1-80km length and 400m width
Bloom event dates (yyyy/mm/dd): Start: 2004-08-05, End: 2004-09-03
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (5800000 cells/L)
monospecific bloom
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Details in daily HABs newsletter issued by NFRDI and webpage (http//

Environmental Conditions

Weather: fine Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 21.8-26.0 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information: PHOSPHATE: 0.1-0.5uM
DIN: 11-50uM
Temperature Range During Event: Max: 31 °C, Min: 21 °C
Salinity Range During Event: Max: 32, Min: 29
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments Extending to the Southeastern coast
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information: culturing finfishes such as rockfish, flounder and seabream were died by suffocation when they were exposed to the dense bloom
Economic losses: direc loss : USD 120,000
Management decision: dispersion of yellow clay
Additional harmful effect information: