General Information

Event name: CR-03-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities , Foam/Mucilage in the coast , Other ( strong fetid odour)
Event directly affected:
Natural Fish , Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: Yes (ictiotoxin)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Research project of the University of Costa Rica)
Event occurred before in this location: Yes (Gulf of Nicoya)
Individuals to contact: VARGAS MONTERO MARIBELLE

Location & Date

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Location: Latitude: 9.979444, Longitude: -84.860556
General location information: Gulf of Nicoya,
HAB Area code(s): CR-10
Additional location information: The bloom had reached its broadest spatial extent of approximately 50km2
Bloom event dates (yyyy/mm/dd): Event Date:2003-09-01
Start: 2003-01-01, End: 2004-06-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides Margalef 1961 (3,8x108 cells/L)
Co-Ocurring Species/Genus: Trichodesmium erythraeum (Ehrenberg) Gomont 1892 ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Vargas et al. 2006. Occurrence and predominance of the fish killer Cochlodinium polykrikoides on the Pacific coast of Costa Rica. African Journal of Marine Science. 28(2):215-217

Environmental Conditions

Weather: Dry season Turbidity (NTU): Wind direction: NW
Stratified water: Yes Oxygen content (nL/L): Wind velocity: 275 m/seg
Temperature (°C): Oxygen saturation %: Current Direction: NW
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:
In situ
Growth Comments
Additional Environmental information: Sample collection was carried out during the dry season and the rainy season while the bloom lasted

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:
Management decision:
Additional harmful effect information: Hundreds of dead fish,comprising members of the families Carangidae, Lutjanidae,Muraenidae, Engraulidae and Soleidae, were observed near the central Pacific coast.
Created at 05:26 on 29 Oct 2015
Updated at 05:28 on 29 Oct 2015