Harmful Algal Information System: Event ZAF-11-001

General Information

Event name:	ZAF-11-001
Country:	SOUTH AFRICA
Nature of the harmful event:	Mass mortalities
Event directly affected:	Natural Fish
Toxicity detected:	No
Associated syndrome:
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	No
Event occurred before in this location:	Yes (This is the 5th recorded bloom of this species)
Individuals to contact:	MANSFIELD, Lisa

Location & Date

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Location:	Latitude: -34.358333, Longitude: 18.665556
General location information:	Cape Peninsula, South Coast, South Africa HAB Area code(s): ZAF-02
Additional location information:	predominantly on the western side of the Cape Peninsula.
Bloom event dates (yyyy/mm/dd):	Event Date:2011-11-07 Start: 2011-11-04, End: 2012-02-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Gonyaulax polygramma (>220000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
Event-related bibliography:	VAN DER LINGEN, C.D., HUTCHINGS L., LAMONT, T. and G.C. PITCHER 2016 – Climate change, dinoflagellate blooms and sardine in the southern Benguela Current Large Marine Ecosystem. Environmental Development, 17: 230-243.

Environmental Conditions

Weather:	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:

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:

Sardine (Sardinops sagax) is the main target of the South African purse-seine fishery and is also ecologically important as it is the dominant prey of many species of piscivorous fish, marine mammals and seabirds.

Management decision:

Additional harmful effect information:

Created at 01:04 on 24 Aug 2020