General Information

Event name: NI-05-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Bivalve (Anadara tuberculosa)
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes
Individuals to contact: Jesus Marin Ruiz , Ronaldo Gutierrez , Ninoska Chow Wong

Location & Date

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Location: Latitude: , Longitude:
General location information: Corinto bay, Department of Leon, Nicaragua, Central America
HAB Area code(s): NI-02
Additional location information: 7 miles from Corinto bay
Bloom event dates (yyyy/mm/dd): Event Date:2005-11-05
Start: 2005-11-05, End: 2005-11-10
Quarantine levels dates (yyyy/mm/dd): First detection: 2005-11-16, End: 2005-12-01
Additional date-related information: Ten analysis of saxitoxin were carried out in the laboratory ofthe Ministry of Health using the tissue of bivalve and applying the mouse bioassay. In 19 th of december 2005 the Ministry of Health suspended the prohibition of extracting, sell or consume shellfish, guiding to maintain surveillance for aperiod of four weeks.


Causative organism known: Yes
Causative Species/Genus: Pyrodinium bahamense (17328446 cells/L)
Monospecific bloom. When this event occured our center had no trained staff in the identification of harmful marine microalgae, so the identification was carried out by experts of FDA which were invited by the Ministry of Health.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: This event had a strong economic impact in six municipalities whose main sources of income are the harvesting and commercialization of molluscs. This event was associated with 50 cases of PSP toxicity, includind one death, following consumption of mangrove cockles (Anadara tuberculosa)
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:
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
Pyrodinium bahamense Saxitoxins STX 1265 g STX /100 g o Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Positive animal assay (mice of approximately 20 g)
Economic losses: This event had a strong economic impact in six communities,whose main sources of income are the harvesting and commercialization of molluscs. This event was associated with 50 cases of PSP intoxicaton, including one death.
Management decision: For a period of approximately 45 days (early november - 19 december 2005) the Ministry of Health recomended and prohibited to the general population not to consume seafood, specially oyster and blackshells fron the pacific region due to suspected of red tide. After this date was oriented to maintain surveillance for no minimum period of four weeks , because the toxins in the shellfish requiere a similar period for remove it.
Additional harmful effect information:
Created at 04:52 on 29 Oct 2015