General Information

Event name: ES-00-009
Country: SPAIN
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 2.7-168 ppm DA.)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Pla de Vigilancia de Fitoplancton Toxic i Nociu a la Costa Catalana.)
Event occurred before in this location: Yes (Detected annualy from 1995; generally with a periodicity of two events a year: at the beginning - middle of spring and autumn.)
Individuals to contact: MANEIRO, Juan , PAZOS, Yolanda , MOROĐO, ┴ngeles

Location & Date

[View larger map]
Location: Latitude: 42.181667, Longitude: -8.685167
General location information: RÝas Baixas (Vigo, Pontevedra, Arousa and Mur, Galicia, NW Spain.
HAB Area code(s): ES-07 ES-08
Additional location information: RÝas Baixas: Vigo, Pontevedra, Arousa and Muros. 42║ 10.90' - 43║ 24.55' N ; 8║ 41.11' - 9║ 03.00' W. The affected area is dedicated to intensive mussel cultivation in rafts, and to a high production of other molluscs in natural banks: clams, cockles, oyster and scallops are the main species exploited.
Bloom event dates (yyyy/mm/dd): Event Date:2000-04-18
Start: 2000-02-28, End: 2000-05-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Initial and final event dates are approximate, because before and after the event, toxic cells are present in the water in low concentrations, and toxicity in molluscs is in undetectable levels.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia australis (321,900 cells/L)
Determined by electronic microscopy. Other species from te same genera are present in low concentrations.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 2.3 Ág/L Chl¬. µg/l
Additional bloom information: Additonal species: Almost nonespecific.
Event-related bibliography:

Environmental Conditions

Weather: Rainy. Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): 13 mL/L Wind velocity: 55
Temperature (°C): 13 (0 m); 15 (1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 39.9 (0 m) Current Velocity: 0
Nutrient information: AMONIUM: 0.88 Ámol/L
NITRATE: 1.72 Ámol/L
NITRITE: 0.27 Ámol/L
PHOSPHATE: 0.25 Ámol/L
SILICATE: 2.42 Ámol/L
Temperature Range During Event: Max: 15 °C, Min: 13 °C
Salinity Range During Event: Max: 34, Min: 35
Bloom location in the water column:
Growth Comments Not evaluated.
Additional Environmental information: Data are the average value for the water column (0-15 m). Stn A2. Ria of Arousa.18/4/00. Wind velocity: 55 m/s. Wind direction: Variable.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Raft cultured mussel Domoic Acid DA eq 168 ppm LC
Kit used: No Type of kit used:
Additional information: Raft cultured mussel (M. galloprovincialis and benthic shellfish). AOAC Official Method, 1998 991.26, Domoic Acid in Mussels. Liquid Chromatographic Method.
Economic losses: Not evaluated.
Management decision: Harvesting was closed in culture areas when domoic acid concentrations was greater than 20 ppm.
Additional harmful effect information: AOAC Official Method, 1998 991.26, Domoic Acid in Mussels. Liquid Chromatographic Method. Irrelevant effects, because the closures caused by this event were brief (two weeks maximum). Closures due to the presence of toxicity in molluscs is usual in the