General Information

Event name: US-90-009
Nature of the harmful event:
Water Discoloration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Chronic annual blooms.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Sandy Hook Bay and Shrewsbury River., New Jersey.
HAB Area code(s): US-09
Additional location information: Sandy Hook Bay, New Jersey, especially the south shore area; Shrewsbury River, especially in the vicinity of Branchport Creek tributary.
Bloom event dates (yyyy/mm/dd): Event Date:1990-06-18
Start: 1990-09-18,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cyclotella sp. (16,000,000 cells/L)
In Branchport Creek, dominant species
Phaeodactylum tricornutum ( cells/L)
In Branchport Creek, subdominant species.
Katodinium rotundatum ( cells/L)
Sandy Hook Bay at Atlantic Highlands, dominant
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: chlorophytes also abundant
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments Primarily an in-situ population; diatoms possibly of neritic origin.
Additional Environmental information: Water turbid, flocculent; no other measurements taken.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Increased surveillance by the Monmouth county Health Department in liaison with NJ DEP.
Additional harmful effect information: Localized green water in Branchport Creek (concurrent with developing red tide in the bay), kill of small fish observed coincident with green water