General Information

Event name: MX-06-004
Country: MEXICO
Nature of the harmful event:
Seafood toxins
Event directly affected:
Planktonic life , Natural Fish
Toxicity detected: Yes (Approximate range: 0.06-0.55 ug/g)
Associated syndrome: ASP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Mareas Rojas (COFEPRIS))
Event occurred before in this location: Yes
Individuals to contact: Rosalba Alonso Rodriguez

Location & Date

[View larger map]
Location: Latitude: 24.000000, Longitude: -110.000000
General location information: Bahia de La Paz, Baja California Sur
HAB Area code(s): GC
Additional location information: Barco Hundido, El Mogote, Punta Mogote (PM). Marina Palmira, El Caimancito, Punta Prieta
Bloom event dates (yyyy/mm/dd): Start: 2006-06-09, End: 2006-07-07
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Sanitary closure and surveillance for a month


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia seriata ( cells/L)
Pseudo-nitzschia spp. (2,400,000 cells/L)
Pseudo-nitzschia pungens ( cells/L)
Co-Ocurring Species/Genus: Chaetoceros spp. (965,000 cells/L)
Thalassiosira eccentrica (Ehrenberg) Cleve 1904 (2,300,000 cells/L)
Chlorophyll concentration, if known: 9.3 ug/L µg/l
Additional bloom information: fucoxanthin
Event-related bibliography: Comisión Federal para la Protección contra Riesgos Sanitarios. 2006. López-Cortés D. J., E. J. Núñez-Vázquez, C. J. Band-Schmidt, I. Gárate-Lizárraga, F. E. Hernández-Sandoval, J. J. Bustillos-Guzmán. 2015. Mass fish die-off during a diatom bloom in the Bahía de La Paz, Gulf of California. Hidrobiológica 25 (1): 39-48. 22. Núñez-Vázquez, E., Gárate-Lizárraga, I., Band-Schmidt, C.J., Cordero-Tapia, A., López-Cortéz, D.J., Hernández-Sandoval, F.H., Heredia-Tapia, A., Bustillos-Guzmán, J.J. 2011. Impact of harmful algal blooms on wild and cultured animals in the Gulf of California. J. Environm Biol. 32(1/2): 413-423

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
Megapitaria squalida and Dosinia ponderosa Domoic Acid 0.06-0.55 ug/g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Mouse bioassay and HPLC-UV
Economic losses:
Management decision: Sanitary closure
Additional harmful effect information: Fish died. Scomber japonicus, C. punctatissima, S. sadax, Scarus sp., Eucinostomus sp., Bodianus sp.
Created at 10:00 on 27 Dec 2018
Updated at 10:38 on 6 Dec 2021