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Temperature tolerances of toxic dinoflagellate cysts: application to the treatment of ships' ballast water
journal contribution
posted on 2023-05-16, 10:47 authored by Gustaaf HallegraeffGustaaf Hallegraeff, Valentine, JP, Marshall, JA, Christopher BolchChristopher BolchUsing toxic dinoflagellates and their resistant resting cysts as model organisms, we demonstrate the potential of heat treatment as a method to minimise the transport of harmful aquatic organisms via ships' ballast water. Vegetative dinoflagellate cultures of Gymnodinium catenatum could be readily killed using temperatures as low as 35 °C and treatment times in the range 30 minutes to 5 h. The resistant resting cysts (hypnozygotes) of G. catenatum were killed after 2 h at 35 °C and the cysts of Alexandrium catenella were killed after 4.5 h at 38 °C. A careful assessment of various waste heat sources on the BHP bulk carrier 'Iron Whyalla' has confirmed the practicability of this approach, and a successful pilot heat treatment plant was trialled on-board ship in April 1997.
History
Publication title
Aquatic EcologyVolume
31Pagination
47-52ISSN
1386-2588Department/School
School of Natural SciencesPublisher
Kluwer Academic PublishersPlace of publication
BelgiumRepository Status
- Restricted