General Information

Event name: RU-17-001
Nature of the harmful event:
Water Discoloration , Mass mortalities , Other ( Pink salmon (Oncorhynchus gorbuscha) was sluggish and soon died in a net trap.)
Event directly affected:
Natural Fish
Toxicity detected: Yes (Approximate range: 5 μg kg-1 with specificity to different PSP toxins of: PSP, 100%; decarbomoyl PSP, 20%; gonyautoxin II and III, 70%; neosaxitoxin, 12%.)
Associated syndrome: PSP
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Oncorhynchus gorbuscha
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: ORLOVA, Tatiana Yu , LEPSKAYA, Ekaterina , MOROZOVA, Tatiana

Location & Date

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Location: Latitude: 60.595278, Longitude: 168.444722
General location information: , Olyutorsky Bay, Bering Sea
HAB Area code(s): RU-06
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2017-07-21
Start: 2017-07-11,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium tamarense (132000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 15-25 mg m-3 µg/l
Additional bloom information:
Event-related bibliography: Lepskaya E.V., Mogilnikova T.A., Shubkin S.V., Tepnin O.B. Red tides in Kamchatka coastal waters (Bering Sea, Russia) are a barrier for the salmon fishery and Pacific salmon. Harmful Algal News. 2018. 59, 20-21.

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: the bloom extended along the central coastal zone of the bay, in a layer approximately 5-6 m in depth.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Yes Type of kit used: RIDASCREENŽ FAST PSP SC,
Additional information: Saxitoxin content in seawater samples was determined by an immune-enzyme assay (IEA). The test-system detection limit is 5 μg kg-1 with specificity to different PSP toxins of: PSP, 100%; decarbomoyl PSP, 20%; gonyautoxin II and III, 70%; neosaxitoxin, 12%. Saxitoxin concentration of the seawater sampled was 0.33 μg L -1.
Economic losses:
Management decision:
Additional harmful effect information: There was mortality of some pink salmon individuals and re-distribution of the migratory paths for salmon, with most of them moving to the rivers adjacent to Olutorsky Bay.
Created at 01:23 on 27 Sep 2022
Updated at 01:25 on 27 Sep 2022