General Information

Event name: US-20-012
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Planktonic life
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (NH Department of Environmental Services/Shellfish Program's Biotoxin monitoring program)
Event occurred before in this location: No
Individuals to contact: NASH, Chris

Location & Date

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Location: Latitude: , Longitude:
General location information: Hampton/Seabrook Harbor, New Hampshire
HAB Area code(s): US-03
Additional location information: Precautionary summer harvest closure, fall blooms during seasonal closure. Neither bloom produced DA above quar levels.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 6/4/20-7/17/20 and Oct-Nov. 2020


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (5,600,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Dr. Kate Hubbard analyzing samples to identify species composition. most of the june july bloom was PN delicatissima. the large cell october/november bloom was a mix of PN species that included australis, multiseries, plurisecta, pungens, and others
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: Advected
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses: none: did not affect any planned commercial harvests
Management decision: precautionary harvest closure june/july 2020.
Additional harmful effect information:
Created at 11:59 on 19 Apr 2021