Harmful Algal Information System: Event US-24-002

General Information

Event name:	US-24-002
Country:	UNITED STATES
Nature of the harmful event:	Water Discoloration , Mass mortalities
Event directly affected:	Natural Fish , Aquaculture Fish , Shellfish
Toxicity detected:	No
Associated syndrome:
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes (HAB OA, PEP)
Event occurred before in this location:	Yes
Individuals to contact:	GOBLER

Location:	Latitude: , Longitude:
General location information:	Peconic Estuary (Meetinghouse Creek), South Shore (Shinnecock Bay), HAB Area code(s): US-08
Additional location information:	Shinnecock Bay, the bloom was mostly confined to Old Fort Pond Detected from 29/07/2024 to 01/10/2024. Peak bloom was on 6-August-2024 at 2,600 cells/mL and second peak on 13-August-2024 at 1020 cells/mL
Bloom event dates (yyyy/mm/dd):	Start: 2024-07-29, End: 2024-10-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Causative organism known:	Yes
Causative Species/Genus:	Margalefidinium polykrikoides (Margalef, 1961) F.GÃ³mez, Richlen & D.M.Anderson, 2017 (Peconic: 2500 cells/mL South:2600 cells/mL cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
Event-related bibliography:

Nutrient information:

Temperature Range During Event:

Max: 30.66 °C, Min: 12.6 °C

Salinity Range During Event:

Max: 30.94, Min: 8.3

Bloom location in the water column:

Surface

Growth:

In situ

Growth Comments

Additional Environmental 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:

6 fish kill events reported

Created at 01:14 on 9 Apr 2025