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Mitigating fish-killing algal blooms with PAC modified clays: efficacy for cell flocculation and ichthyotoxin adsorption

Seger, A and Hallegraeff, G ORCID: 0000-0001-8464-7343 2017 , 'Mitigating fish-killing algal blooms with PAC modified clays: efficacy for cell flocculation and ichthyotoxin adsorption', in LAO Proenca and GM Hallegraeff (eds.), Proceedings of the 17th International Conference on Harmful Algae 2016 , International Society for the Study of Harmful Algae (ISSHA), Intergovernmental Oceanographic Commission of UNESCO, pp. 154-157 .

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Abstract

Flocculation of harmful algal cells through treatment with modified clay minerals offers great promise inreducing clay loadings required for effective cell removal, yet the ichthyotoxin adsorptive properties of suchmodified clays have received little attention. We here compare Chattonella marina (raphidophyte) cellremoval by conventional (kaolin, bentonite) and polyaluminium chloride (PAC) modified clays (bentoniteand Korean loess), while newly exploring the capacity of PAC and PAC modified clays to mitigate C.marina and Alexandrium catenella (dinoflagellate) ichthyotoxicity (quantified with the RTgill-W1 cell lineassay). Conventional clays proved ineffective in reducing C. marina cell numbers (14±5% removal at 0.5 gL-1), but treatment efficacy could be much improved through modification of bentonite and Korean loesswith PAC (85±5% removal at 0.1 g L-1). Ichthyotoxin adsorption by PAC and PAC modified clays provedspecies specific. While both PAC (0.1 g L-1) and PAC modified clays (0.25 g L-1) could completely eliminateC. marina cytotoxicity, only bentonite clay proved effective in mitigating the negative impact of lysed A.catenella preparations on the gill cell line (69±10% gill cell viability). This work highlights how applicationof modified clays extends beyond improved cell flocculating properties to also include adsorption of selectedichthyotoxins.

Item Type: Conference Publication
Authors/Creators:Seger, A and Hallegraeff, G
Keywords: mitigation, modified clay, ichthyotoxin adsorption, flocculation, fish-killing algae
Journal or Publication Title: Proceedings of the 17th International Conference on Harmful Algae 2016
Publisher: International Society for the Study of Harmful Algae (ISSHA), Intergovernmental Oceanographic Commission of UNESCO
Copyright Information:

Copyright 2017 The International Society for the Study of Harmful Algae.

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