General Information

Event name: MX-01-001
Country: MEXICO
Nature of the harmful event:
Other ( Part of a project)
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 0.14 to 5.46 ug STXeq / 100 g soft tissues)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Megapitaria squalida
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: Rosalba Alonso Rodriguez

Location & Date

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Location: Latitude: 24.175278, Longitude: -110.350000
General location information: Bahía de la Paz, La Paz, B. C. S.
HAB Area code(s): GC
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2001-12-14
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium affine (Inoue et Kukuyo) Balech 1992 ( cells/L)
Ceratium furca (Ehrenberg) Claparède et Lachmann 1859 ( cells/L)
Gonyaulax digitale (Pouchet) Kofoid 1911 ( cells/L)
Gymnodinium catenatum Graham 1943 (2.6 x 10^3 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Gárate-Lizárraga, I., Bustillos-Guzmán, J. J., Erler, K., Muñetón-Gómez, M. S., Luckas, B., Tripp-Quezada, A. 2004. Paralytic shellfish toxins in the chocolata clam, Megapitaria squalida (Bivalvia: Veneridae), in Bahía de la Paz, Gulf of California. Rev. Biol. Trop. 52(Suppl. 1): 133-140.

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
Saxitoxins STX 38.69%mol LC-UV
Saxitoxins GTX2 14.19%mol LC-UV
Saxitoxins GTX3 16.02%mol LC-UV
Saxitoxins dcGTX3 4.11%mol LC-UV
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 05:28 on 22 Feb 2018