General Information

Event name: US-05-023
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
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 (Previous brown tide bloom lasted from 1989-1997)
Individuals to contact: Byrd, Meridith

Location & Date

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Location: Latitude: , Longitude:
General location information: Laguna Madre, Texas
HAB Area code(s): US-18
Additional location information: The Laguna Madre is a semi-enclosed hypersaline estuary with an area of approximately 3658 square kilometers. It is often divided into the Upper Laguna and Lower Laguna. This bloom encompassed the entire Laguna Madre
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Texas Parks and Wildlife began receiving reports of discolored water in Baffin Bay in late January 2005. Brown tide was confirmed on March 3, 2005 and continues to show up (at low levels) in water samples taken by the University of Texas Marine Science Institute from the Upper Laguna Madre north of Baffin Bay.


Causative organism known: Yes
Causative Species/Genus: Aureoumbra lagunensis (1.7x10^9 cells/L)
Recorded by Tracy Villareal, University of Texas Marine Science Institute
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

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: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information: Bloom occurred in a hypersaline estuary.

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: Fishing guides complained of declining business. The murky water caused some people not to book fishing trips in the bays.
Management decision:
Additional harmful effect information: