General Information

Event name: US-15-011
Nature of the harmful event:
Event directly affected:
Planktonic life , Natural Fish , Birds , Shellfish , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 680g/100g)
Associated syndrome: PSP
Unexplained toxicity: Yes (dead sea otters, sea lions and birds in Aleutian Islands)
Species implicated in toxin transmission (transvector): sand lance, herring, gulls to eagles
Report the outcome of a monitoring programme: Yes (Aleutian Pribilof Islands Assoc HAB Program, Alaska Sea Grant agent in Unalaska, Qagan Tayagungin Tribe in Sand Point)
Event occurred before in this location: Yes (peak years 2008, 2010, 2014, and 2015)
Individuals to contact: GOOD, Melissa , PORCINCULA, Karis

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Aleutian Islands, Alaska
HAB Area code(s): US-26
Additional location information: satellite images indicated bloom covered entire continental shelf from Ketchikan to Aleutian Islands
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2015-01-01, End: 2015-12-31
Additional date-related information: High PSP lvls detected every month of year.


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. ( cells/L)
toxicity testing HPLC
Co-Ocurring Species/Genus: Pseudo-nitzschia spp. ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 6C -16C Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 16 °C, Min: -2 °C
Salinity Range During Event:
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
herring Other
butter clams Other
Blue Mussels Other
sand lance Other
Kit used: Type of kit used:
Additional information: HPLC from Alaska Department of Environmental Conservation Environmental Health Lab
Economic losses: Direct loss of subsistence and personal use of bivalves.
Management decision:
Additional harmful effect information: loss of 100,000 murres due to starvation likely a result of the PSTs and DA eliminating zooplankton and disruptiiong the food web.
Created at 10:21 on 3 Feb 2017
Updated at 02:47 on 6 Feb 2020