Potential control of toxic cyanobacteria blooms with Moroccan seaweed extracts

  • Soukaina El Amrani Zerrifi
  • Zakaria Tazart
  • Fatima El Khalloufi
  • Brahim Oudra
  • Alexandre Campos
  • Vitor VasconcelosEmail author
Research Article


Marine macroalgae are a promising source of diverse bioactive compounds with applications in the biocontrol of harmful cyanobacteria blooms (cyanoHABs). In this work, we evaluated the potential algicidal activities of 14 species of seaweed collected from the coast of Souiria Laqdima, Morocco. Methanol extracts were screened in solid and liquid medium against the growth of the toxic cyanobacteria Microcystis aeruginosa and the microalgae Chlorella sp. used as food supplement. The results in solid medium revealed that the algicidal activity was limited to M. aeruginosa with the extract of Bornetia secundiflora showing the highest growth inhibition activity against Microcystis (27.33 ± 0.33 mm), whereas the extracts of Laminaria digitata, Halopytis incurvus, Ulva lactuca, and Sargasum muticum showed no inhibition. In liquid medium, the results indicated that all methanolic extracts of different macroalgae tested have a significant inhibitory effect on M. aeruginosa compared with that of the negative control. The maximum inhibition rates of M. aeruginosa were produced by the extracts of Bifurcaria tuberculata, Codium elongatum, and B. secundiflora. Moreover, the extracts of B. secundiflora recorded the maximum inhibition rate of Chlorella sp. Overall, the results highlight the potential of the extracts from macroalgae to control toxic cyanobacteria species.


CyanoHABs Microcystis Algicidal activity Seaweeds extracts Biocide effect Biocontrol 


Funding information

We acknowledge the projects TOXICROP (823860) funded by the H2020 program MSCA-RISE-2018 and the project VALORMAR (24517) of the 10/SI/2016-I&DT Empresarial-Programas Mobilizadores funded by the European Regional Development Fund (ERDF) and by the European Social Fund (ESF),


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratory of Biology and Biotechnology of Microorganisms, Faculty of Sciences Semlalia MarrakechCadi Ayyad UniversityMarrakechMorocco
  2. 2.Polydisciplinary Faculty of Khouribga (FPK)Sultan Moulay Slimane UniversityBeni-MellalMorocco
  3. 3.CIIMAR, Interdisciplinary Centre of Marine and Environmental ResearchTerminal de Cruzeiros do Porto de LeixõesMatosinhosPortugal
  4. 4.Departament of Biology, Faculty of SciencesUniversity of PortoPortoPortugal

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