General Information

Event name: NZ-93-003
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Routine biotoxin monitoring program)
Event occurred before in this location: No
Individuals to contact: RHODES Lesley

Location & Date

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Location: Latitude: -41.013056, Longitude: 174.085278
General location information: Anakoha Bay, South Island
HAB Area code(s): NZ-08
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1993-12-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium minutum (13 000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: MacKenzie, L. (1994). A bloom of Alexandrium minutum in Anakoha Bay, Marlborough Sounds (Dec 1993–Jan 1994). Seafood NZ, 2(5), 50-52.

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
Alexandrium minutum Saxitoxins GTX5 425 µg/100g Other
Kit used: Type of kit used:
Additional information: +positive mouse bioassay
Economic losses:
Management decision: Voluntary closure of the bay and surrounding areas.
Additional harmful effect information:
Created at 03:06 on 21 Feb 2018
Updated at 01:44 on 13 Mar 2018