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Journal Issue Volume 32 Issue 1 Antibacterial Potential of Gracilaria edulis...

Short Communication

Antibacterial Potential of Gracilaria edulis Extracts Against Pathogenic Bacteria: Input to Organic Aquaculture

Nielvin R. Cansejo

DA-Bureau of Fisheries and Aquatic Resources - RO2, Regional Government Center, Carig Sur, Tuguegarao City, Cagayan, 3500 Philippines

Cagayan State University – Aparri Campus, Maura, Aparri, Cagayan, 3515 Philippines

Corresponding author

nielvincansejobfar02@gmail.com

, Regine G. Calucag^2,3, Emma L. Ballad¹ , Glycinea M. de Peralta²

¹ DA-Bureau of Fisheries and Aquatic Resources - RO2, Regional Government Center, Carig Sur, Tuguegarao City, Cagayan, 3500 Philippines
² Cagayan State University – Aparri Campus, Maura, Aparri, Cagayan, 3515 Philippines
³ DA-Bureau of Fisheries and Aquatic Resources - CAR, Easter Road, Guisad, Baguio City, 2600 Philippines

Page 1-8 | Received 15 Feb 2023, Accepted 6 Feb 2025

Abstract

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.

Keywords: aquaculture, pathogenic bacteria, ethanolic crude extract, methanolic crude extract, paper disc diffusion method, zone of inhibition