General Information

Event name: NZ-10-001
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: RHODES Lesley

Location & Date

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Location: Latitude: -41.081389, Longitude: 174.333056
General location information: Ruakaka Bay, South Island
HAB Area code(s): NZ-08
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2010-06-05, End: 2010-06-12
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Chattonella verruculosa (120,000 cells/L)
Real name: Pseudochattonella verruculosa
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: MacKenzie, L. A., Smith, K. F., Rhodes, L. L., Brown, A., Langi, V., Edgar, M., ... & Preece, M. (2011). Mortalities of sea-cage salmon (Oncorhynchus tshawytscha) due to a bloom of Pseudochattonella verruculosa (Dictyochophyceae) in Queen Charlotte Sound, New Zealand. Harmful Algae, 11, 45-53.

Environmental Conditions

Weather: Heavy overcast with rain Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 12 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 34.2 Current Velocity:
Nutrient information: NITRATE: 6.0 mmol N/m^3
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: No Type of kit used:
Additional information:
Economic losses: 200 tons of salmon (Oncorhynchus tshawytscha) lost (15% of the total fish stock of the farm)
Management decision: Towing away of cages
Additional harmful effect information: The pathologies observed in kidney and liver of salmons tissues could also be consistent with exposure to nephro- and hepato-toxins.
Created at 10:11 on 10 Jan 2018
Updated at 01:18 on 13 Mar 2018