General Information

Event name: NZ-81-001
Nature of the harmful event:
High Phyto concentration , Foam/Mucilage in the coast
Event directly affected:
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 (In the 1860s, 1901, 1960)
Individuals to contact: Hallegraeff Gustaaf

Location & Date

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Location: Latitude: -41.045556, Longitude: 173.293056
General location information: Tasman Bay, South Island
HAB Area code(s): NZ-07
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1981-10-06
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gonyaulax turbynei Murray et Whitting 1899 ( cells/L)
Co-Ocurring Species/Genus: Gonyaulax sp. ( cells/L)
Gonyaulax hyalina
Gymnodinium sp. ( cells/L)
Phaeocystis pouchetii (Hariot) Lagerheim 1893 ( cells/L)
Chlorophyll concentration, if known: 9.6 µg/l
Additional bloom information: In 1981, the most conspicuous species present were a variety of dinoflagellates, in particular the armored species G. hyalina and Gonyaulax turbinyei and an unarmored Gymnodinium sp. Although in hind sight it seems obvious that these organisms were most probably responsible for the mass accumulation of the mucilage, at the time it was thought that these dinoflagellates had been entrapped, like many other phytoplankton species and much detrital matte
Event-related bibliography: MacKenzie, L., Sims, I., Beuzenberg, V., & Gillespie, P. (2002). Mass accumulation of mucilage caused by dinoflagellate polysaccharide exudates in Tasman Bay, New Zealand. Harmful Algae, 1(1), 69-83.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information: NITRATE: 7.1
DIN: 0.9
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:

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: Bloom reduced fish catches and severely affected the livelihood of fishermen.
Management decision:
Additional harmful effect information: Event called "Tasman Bay Slime"
Created at 09:53 on 10 Jan 2018
Updated at 11:37 on 13 Mar 2018