General Information

Event name: NZ-89-001
Nature of the harmful event:
High Phyto concentration , Mass mortalities
Event directly affected:
Aquaculture Fish
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: Hallegraeff Gustaaf , RHODES Lesley

Location & Date

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Location: Latitude: -46.982778, Longitude: 168.119444
General location information: Big Glory Bay, South Island
HAB Area code(s): NZ-11
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1989-01-03, End: 1989-01-11
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Heterosigma akashiwo (Hada) Hada ex Hara et Chihara 1987 (2000000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Chang, F. H., Anderson, C., & Boustead, N. C. (1990). First record of a Heterosigma (Raphidophyceae) bloom with associated mortality of cage‐reared salmon in Big Glory Bay, New Zealand. New Zealand journal of marine and freshwater research, 24(4), 461-469.

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 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: 17M NZ$ loss (600 t of salmon)
Management decision:
Additional harmful effect information: "In our case the pathological changes in gills and intestine were consistent with acute exposure to a necrotising toxin."
Created at 09:48 on 10 Jan 2018
Updated at 01:48 on 13 Mar 2018