General Information

Event name: AR-93-005
Nature of the harmful event:
Mass mortalities
Event directly affected:
Natural Fish
Toxicity detected: Yes (Approximate range: 2800 g STX eq/100g tissue (stomach content))
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: SCHWEIBOLD Laura

Location & Date

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Location: Latitude: , Longitude:
General location information: El Rincon, Buenos Aires
HAB Area code(s): AR-01
Additional location information: on the continental shelf
Bloom event dates (yyyy/mm/dd): Event Date:1993-09-17
Start: 1993-09-01, End: 1993-09-30
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Event date = first mortalities observed


Causative organism known: Yes
Causative Species/Genus: Alexandrium tamarense (3.45x10^5 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Montoya, N.G., R. Akselman, J. Franco, and J.I. Carreto. 1996. Paralytic shellfish toxins and mackerel (Scomber japonicus) mortality in the Argentine Sea. Pp. 417420 in Harmful and Toxic Algal Blooms. T. Yasumoto, Y. Oshima, and Y. Fukuyo, eds, Intergovernmental Oceanographic Commission of UNESCO, Paris.

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 Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Alexandrium tamarense Saxitoxins GTX4 LC
Alexandrium tamarense Saxitoxins GTX1 LC
Kit used: Type of kit used:
Additional information: 2800, 500, 361 and 72 g STX eq/100 g tissue were found in stomach contents, intestine, liver and gills respectively.
Economic losses:
Management decision:
Additional harmful effect information: massive mortality of mackerel
Created at 02:44 on 13 Nov 2019
Updated at 02:56 on 13 Nov 2019