General Information

Event name: NZ-02-001
Nature of the harmful event:
High Phyto concentration , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Shellfish
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (1983, 1993)
Individuals to contact: RHODES Lesley

Location & Date

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Location: Latitude: -36.425556, Longitude: 175.189167
General location information: Hauraki Gulf, North Island
HAB Area code(s): NZ-02
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2002-10-14, End: 2002-12-04
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia concordia Chang et Ryan 2004 (33 000 000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Chang, F. H., Uddstrom, M. J., Pinkerton, M. H., & Richardson, K. M. (2008). Characterising the 2002 toxic Karenia concordia (Dinophyceae) outbreak and its development using satellite imagery on the north-eastern coast of New Zealand. Harmful Algae, 7(4), 532-544.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction: NW
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: Negative Southern Oscillation Index, el Nino conditions, strong north westerly winds, upwelling, nutrient avaibility

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: The entire stock of 8500 abalones from the land-based marine farm in Kennedy bay died
Management decision:
Additional harmful effect information: Positive haemolytic and cytotoxic laboratory tests from cells extracts of Karenia concordia
Created at 10:28 on 4 Mar 2018
Updated at 01:10 on 12 Apr 2018