General Information

Event name: US-94-009
Nature of the harmful event:
Water Discoloration
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Heavy localized blooms of this nature are not uncommon in this location, which lacks flushing and receiver concentrated runoff from surrounding sububrban areas.)
Individuals to contact: OLSEN, Paul

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Oceanport Creek-Branchport Creek., New Jersey.
HAB Area code(s): US-09
Additional location information: Oceanport Creek-Branchport Creek, tributary to Sandy Hook Bay via the Shrewsbury River.
Bloom event dates (yyyy/mm/dd): Event Date:1998-09-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 8 August, 3 September, 21 November.


Causative organism known: Yes
Causative Species/Genus: Navicula sp. ( cells/L)
8 August.
Chaetoceros spp. ( cells/L)
8 August
Prorocentrum minimum ( cells/L)
Prorocentrum redfieldii ( cells/L)
Polykrikos kofoidii ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Maximum cell counts of the dominant > 50,000,000 cells/L.
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:
In situ
Growth Comments
Additional Environmental information:

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: Investigation by Monmouth County Health Department.
Additional harmful effect information: Effects: Intense brown to tea-colored water discoloration; presence of floc from algal decomposition. Numerous dead killies and other dead fish on 13 September.