General Information

Event name: MY-14-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities
Event directly affected:
Natural Fish , Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: Yes (ichthyotoxicity)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: Lim, Po Teen , Teng, Sing Tung , Leaw, Chui Pin

Location & Date

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Location: Latitude: 1.368056, Longitude: 103.640278
General location information: Johor Strait, Johor
HAB Area code(s): MY-3
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2014-02-20
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karlodinium sp. (2340000 cells/L)
Karlodinium australe
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Lim HC, Leaw CP, Tan TH, Kon NF, Yek LH, Hii KS, Teng ST, Mohd Razali R, Usup G, Iwataki M, Lim PT. 2014. A bloom of Karlodinium australe (Gymnodiniales, Dinophyceae) associated with mass mortality of cage-cultured fishes in West Johor Strait, Malaysia. Harmful Algae 40: 51-62.

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: Whole column
Growth Comments
Additional Environmental information: Neap tide.

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 03:45 on 10 Apr 2018
Updated at 10:56 on 20 Oct 2019