General Information

Event name: PHL-83-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 349-532 mouse units/100g)
Associated syndrome: PSP
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Pyrodinium bahamense
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: AZANZA, Rhodora , YNIGUEZ, Aletta

Location & Date

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Location: Latitude: 11.662778, Longitude: 124.930556
General location information: Maqueda and Villareal Bay, Western Samar
HAB Area code(s): PHL-13
Additional location information: bloom extended NW to Masbate
Bloom event dates (yyyy/mm/dd): Event Date:1983-06-01
Start: 1983-06-01, End: 1983-09-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pyrodinium bahamense var. compressum (138269 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Estudillo, R.A. and C.L. Gonzales. 1984. Red tides and paralytic shellfish poisoning in the Philippines, p. 52-79. In A.W. White; M. Anraku and K.-K. Hmi (eds.) Toxic red tides and shellfish toxicity in Southeast Asia. Southeast Asian Fisheries Development Center, Singapoh, and International Development Research Centre, Ottawa, Canada.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction: SW
Stratified water: Oxygen content (nL/L): surf: 3.19-5.40; bottom: 0.45-3.86 Wind velocity: 4-8m/s
Temperature (°C): surf: 29.6-32.5; bottom: 26.4-29.8 Oxygen saturation %: Current Direction:
Sechhi disk (m): 1.5-12.5 Salinity: surf: 31.15-33.88; bottom: 33.73-35.28 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 532 MU/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: 278 PSP cases with 21 deaths after consumption of Perna viridis
Created at 04:31 on 26 Sep 2017
Updated at 04:07 on 27 Sep 2017