Harmful Algal Information System: Event RU-17-001

General Information

Event name:	RU-17-001
Country:	RUSSIAN FEDERATION
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:

Microalgae

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:

Subsurface

Growth:

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: RIDASCREEN� 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