General Information

Event name: US-99-012
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: Yes
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Direct.
Report the outcome of a monitoring programme: Yes (NMFS 1997-1999.)
Event occurred before in this location: Yes (Possibly mid 1980's, confirmed 1995, 1997.)
Individuals to contact: MAHONEY, John

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: New York Bight Region., Central New Jersey.
HAB Area code(s): US-09
Additional location information: Barnegat Bay, southern half.
Bloom event dates (yyyy/mm/dd): Event Date:1999-05-04
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (2-3 x (10) cells/L)
Many samples being recounted currently due to procedure problem
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Not available at this time.
Event-related bibliography: Mahoney et al, 1999 Proc. 6th Canadian workshop on Harmful Marine Algae.

Environmental Conditions

Weather: Turbidity (NTU): 0.4 Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 21.8 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 30.5 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 29 °C, Min: 13 °C
Salinity Range During Event: Max: 32, Min: 23
Bloom location in the water column: Whole column
Growth: Advected
In situ
Growth Comments Developed in locale, widespread later.
Additional Environmental information: Bay relatively shallow: average 2 m in southern half. Location in water column not determined but probably throughout.

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: Unknown largely, 2 moth delay in clam growth to marketing size.
Management decision: NJ Dept. of Environmental Protection researcher expresses intent to study problem.
Additional harmful effect information: Associated syndrom: Approximately 2 month inhibition of cultured juvenile hard clams growth. Effects on natural biota major information gap.