Harmful Algal Information System: Event NL-17-001

General Information

Event name:	NL-17-001
Country:	NETHERLANDS
Nature of the harmful event:	Seafood toxins
Event directly affected:	Shellfish
Toxicity detected:	Yes (Approximate range: 51 ug TTX / kg product)
Associated syndrome:	OTHER
Unexplained toxicity:	Yes (Causitive organism in scope not confirmed)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes (National Food Safety Programme)
Event occurred before in this location:	Yes (Since 2015)
Individuals to contact:	POELMAN, Marnix

Location & Date

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Location:	Latitude: 51.486667, Longitude: 4.113056
General location information:	Yerseke Bank, Eastern Scheldt HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd):	Event Date:2017-06-15 Start: 2017-06-15, End: 2017-06-29
Quarantine levels dates (yyyy/mm/dd):	First detection: 2017-06-15, End: 2017-06-22
Additional date-related information:

Microalgae

Causative organism known:	Yes
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	5 µg/l
Additional bloom information:	Most likely non-phytoplanktonic organism
Event-related bibliography:

Environmental Conditions

Weather:		Turbidity (NTU):		Wind direction:
Stratified water:		Oxygen content (nL/L):		Wind velocity:
Temperature (°C):	>20oC	Oxygen saturation %:		Current Direction:
Sechhi disk (m):		Salinity:	30	Current Velocity:

Nutrient information:

Temperature Range During Event:

Max: 20 °C, Min: 23 °C

Salinity Range During Event:

Bloom location in the water column:

Whole column
Subsurface

Growth:

In situ

Growth Comments

Additional Environmental information:

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Mussel	Tetrodotoxins	TTX	20	LC-MS
Oyster	Tetrodotoxins	TTX	51	LC-MS

Kit used: No

Type of kit used:

Additional information:

LC-MS-MS

Economic losses:

No economic losses were reported. However, the event took place during the opening of the mussel season. Trade routes were converted to manage stocks.

Management decision:

No closure of the area for harvest.

Additional harmful effect information:

Created at 03:43 on 5 Mar 2020
Updated at 02:17 on 14 Apr 2021