General Information

Event name: US-07-024
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: Yes (Approximate range: 2-7ug/g tissue goniodimum A)
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: LANDSBERG, Jan

Location & Date

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Location: Latitude: , Longitude:
General location information: Lower York River, Chesapeake Bay
HAB Area code(s): US-10
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2007-09-04
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium monilatum ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Harding, J.M., Mann, R., Moeller, P., Hsia, M.S., 2009. Mortality of the veined rapa whelk, Rapana venosa, in relation to a bloom of Alexandrium monilatum in the York River, United States. J. Shellfish Res. 28, 363367. Wolny, J.L., Tomlinson, M.C., Schollaert Uz, S., Egerton, T.A., McKay, J.R., Meredith, A., Reece, K.S., Scott, G.P., Stumpf, R.P., 2020. Current and future remote sensing of harmful algal blooms in the Chesapeake Bay to support the shellfish industry. Front. Mar. Sci. 7. 337

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
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 04:34 on 24 Jul 2020
Updated at 07:10 on 24 Jul 2020