This research finds significant antibacterial activity of Gracilaria edulis extracts against pathogenic bacteria in aquaculture, suggesting its potential for organic practices.
With pathogenic bacteria in aquaculture becoming increasingly resistant to antibiotics, there is a compelling need to look into bioactive chemicals present in seaweed as novel treatment options for fish infections. This study evaluated the phytochemical characteristics of Gracilaria edulis extracts and their antimicrobial activities against selected aquaculture pathogenic bacteria such as Aeromonas hydrophila, Escherichia coli, and Staphylococcus aureus. The antimicrobial assay test confirmed that both methanolic and ethanolic extracts of G. edulis inhibited the bacteria comparable to that of the positive control. The study, therefore, suggests that G. edulis can further be investigated for the possible formulation of therapeutics and drugs in light of its potential as an antibacterial agent, particularly for organic aquaculture practices.
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Cansejo et al. (2025) studied this question.
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