General Information

Event name: NZ-10-004
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:
Individuals to contact: RHODES Lesley

Location & Date

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Location: Latitude: -41.291667, Longitude: 174.834167
General location information: Mahanga Bay, Wellington harbour, North Island
HAB Area code(s): NZ-06
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2010-05-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: May 2010


Causative organism known: Yes
Causative Species/Genus: Chattonella globosa (9 100 cells/L)
Real name: Vicicitus globosus
Karenia concordia Chang et Ryan 2004 (27 000 cells/L)
Heterosigma akashiwo (Hada) Hada ex Hara et Chihara 1987 (4 000 000 cells/L)
Pseudo-nitzschia americana (Hasle) Fryxell 1993 ( cells/L)
Co-Ocurring Species/Genus: Chattonella verruculosa (5 000 cells/L)
Real name: Pseudochattonella cf. verruculosa
Chlorophyll concentration, if known: µg/l
Additional bloom information: Multispecies bloom
Event-related bibliography: Chang & Mullan. 2012. 15th Int. Conf. on Harmful Algae pp. 199-202

Environmental Conditions

Weather: Calm conditions 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: Mass mortality of cage-reared fish at NIWA's Aquaculture Centre in Mahanga Bay
Management decision:
Additional harmful effect information:
Created at 04:46 on 8 Mar 2018
Updated at 11:25 on 13 Mar 2018