General Information

Event name: NZ-13-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , 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 (Marlborough Shellfish Quality Programme (MSQP))
Event occurred before in this location: Yes (2011)
Individuals to contact: RHODES Lesley

Location & Date

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Location: Latitude: -41.081389, Longitude: 174.333056
General location information: Queen Charlotte Sound, South Island
HAB Area code(s): NZ-08
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2013-01-01, End: 2013-04-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella (1 000 000 cells/L)
Real name: Alexandrium pacificum
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: MacKenzie, L., Harwood, T., Tonks, A., Robinson, J., & Knight, B. (2013). Seafood safety risks from paralytic shellfish poisoning dinoflagellate blooms in New Zealand: 20122013. A report for the Ministry for Primary Industries (MPI) Food Safety. Cawthron Report 2346. Nelson: Cawthron Institute;[cited 2016 Mar 1].

Environmental Conditions

Weather: Fine and sunny 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:
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
Perna canaliculus Saxitoxins STX eq 5.3 mg/kg Other
Kit used: Type of kit used:
Additional information: HPLC screen test
Economic losses:
Management decision: Short closure period of shellfish farms in this area (71 days max)
Additional harmful effect information:
Created at 03:12 on 5 Mar 2018
Updated at 03:40 on 4 May 2018