General Information

Event name: US-19-016
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 564ug/100g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Blue mussels
Report the outcome of a monitoring programme: Yes (NH Department of Environmental Services)
Event occurred before in this location: Yes
Individuals to contact: NASH, Chris

Location & Date

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Location: Latitude: , Longitude:
General location information: New Hampshire,
HAB Area code(s): US-03
Additional location information: Star Island (Gosport Harbor, Isles of Shoals, 42.978611N, 70.611111W) Hampton Harbor monitoring station (42.899308N, 70.817986W) Little Bay- LBDP1 (Emery’s Bridge Oyster Company, 43.11645N, -70.845W)
Bloom event dates (yyyy/mm/dd): Start: 2019-04-30, End: 2019-07-24
Quarantine levels dates (yyyy/mm/dd): First detection: 2019-05-08, End: 2019-11-01
Additional date-related information: Blooms SI 4/3-8/5 Hampton 5/8-7/24 LB 6/9-7/5


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

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:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue mussels Saxitoxins 564ug/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Star Island tox detected 4/30-8/5, max 528ug/100g on 6/26 Hampton tox detected 5/8-7/24, max 564.2ug/100g on 6/25 Little Bay tox detected 6/9-7/5, max 70.8ug/100g on 6/26
Economic losses:
Management decision: Star Island closure from 5/8-8/9 Hampton Harbor closure from 5/9-11/1 (seasonal closure 5/31-11/1) Little Bay precautionary closures 6/5-6/6, 6/28-6/30
Additional harmful effect information:
Created at 04:27 on 8 Apr 2020
Updated at 04:31 on 8 Apr 2020