General Information

Event name: NZ-92-001
Country: NEW ZEALAND
Nature of the harmful event:
High Phyto concentration
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: -46.982778, Longitude: 168.119722
General location information: Big Glory Bay, South Island
HAB Area code(s): NZ-11
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1992-11-01, End: 1992-11-27
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known: Yes
Causative Species/Genus: Emiliania huxleyi (9 600 000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 3800 µg/l
Additional bloom information:
Event-related bibliography: Rhodes, L. L., Peake, B. M., MacKenzie, A. L., & Marwick, S. (1995). Coccolithophores Gephyrocapsa oceanica and Emiliania huxleyi (Prymnesiophyceae= Haptophyceae) in New Zealand's coastal waters: characteristics of blooms and growth in laboratory culture. New Zealand Journal of Marine and Freshwater Research, 29(3), 345-357.

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:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event: Max: 34.7, Min: 34.5
Bloom location in the water column:
Growth:
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: Some salmon mortalities occurred at the time of the bloom and these appeared to be associated with gill disturbance.
Management decision: Salmon cages were towed to refuge sites outside the bay in Paterson Inlet as a precautionary measure
Additional harmful effect information: Emiliania huxleyi is a known dimethyl sulphide (DMS) producer, particularly in the later stages of a bloom (Matrai & Keller 1993). Sulphides are toxic to fish at low levels and have been linked to gill damage (Braaten et al. 1983).
Created at 02:37 on 21 Feb 2018
Updated at 01:47 on 13 Mar 2018