General Information

Event name: NZ-82-002
Nature of the harmful event:
High Phyto concentration
Event directly affected:
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: No
Individuals to contact: RHODES Lesley

Location & Date

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Location: Latitude: -36.990000, Longitude: 176.210000
General location information: Bay of Plenty, North Island
HAB Area code(s): NZ-03
Additional location information: The bloom covered some 8000 km2 and extended from Whangarei Heads in the north to the Bay of Plenty in the south.
Bloom event dates (yyyy/mm/dd): Start: 1982-11-15, End: 1983-03-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cerataulina pelagica (Cleve) Hendey 1937 (10000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Taylor, F. J., Taylor, N. J., & Walsby, J. R. (1985). A bloom of the planktonic diatom, Cerataulina pelagica, off the coast of northeastern New Zealand in 1983, and its contribution to an associated mortality of fish and benthic fauna. International Review of Hydrobiology, 70(6), 773-795.

Environmental Conditions

Weather: Calm condition Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): 17 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 18 °C, Min: 16 °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information: Bloom has been related to unusually calm conditions associated with an unusually low Southern Oscillation Index.

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: During the bloom deaths of benthic shellfish and of bony fish caught on long-lines were reported from the area of the blooni, and these affected the local fishing industry.
Management decision: In any future blooin of this kind we recommend that the long-lines be left out for not longer than one hour, or be buoyed in such a way that the lines do not sink to the bottom but remain suspended above the anoxic debris cloud.
Additional harmful effect information:
Created at 08:12 on 20 Feb 2018
Updated at 10:49 on 13 Mar 2018