Harmful Algal Information System: Event ZAF-67-001

General Information

Event name:	ZAF-67-001
Country:	SOUTH AFRICA
Nature of the harmful event:	Water Discoloration
Event directly affected:	Birds , Shellfish
Toxicity detected:	Yes
Associated syndrome:	PSP
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):	Choromytilus meridionalis and Donax serra
Report the outcome of a monitoring programme:	No
Event occurred before in this location:	No
Individuals to contact:	MANSFIELD, Lisa

Location & Date

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Location:	Latitude: -31.931389, Longitude: 18.161667
General location information:	Elands Bay to Olifants River, West Coast HAB Area code(s): ZAF-01
Additional location information:
Bloom event dates (yyyy/mm/dd):	Start: 1967-12-28, End: 1968-01-28
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Alexandrium catenella (40 x 10e6 cells/L) Reported as Gonyaulax catenella
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
Event-related bibliography:	HORSTMAN, D.A. 1981 – Reported red-water outbreaks and their effects on fauna of the west and south coasts of South Africa, 1959-1980. Fish. Bull. S. Afr. 15: 71-88.

Environmental Conditions

Weather:		Turbidity (NTU):	Wind direction:	S
Stratified water:		Oxygen content (nL/L):	Wind velocity:	15-20 m/sec
Temperature (°C):	20	Oxygen saturation %:	Current Direction:
Sechhi disk (m):		Salinity:	Current Velocity:

Nutrient information:

Temperature Range During Event:

Max: 20 °C, Min: °C

Salinity Range During Event:

Bloom location in the water column:

Growth:

Growth Comments

Additional Environmental information:

HORSTMAN, D.A. 1981 – Reported red-water outbreaks and their effects on fauna of the west and south coasts of South Africa, 1959-1980. Fish. Bull. S. Afr. 15: 71-88.

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Alexandrium catenella				Bioassay-Mouse

Kit used:

Type of kit used:

Additional information:

Economic losses:

Huge quantities of black and white mussels and large quantities of west coast rock lobster

Management decision:

Additional harmful effect information:

Also effected hag fish, sucker fish, octopuses and some sea birds.

Created at 10:34 on 28 Sep 2017
Updated at 01:14 on 23 Jan 2019