Syahidah Ahmad - Academia.edu (original) (raw)

Papers by Syahidah Ahmad

Research paper thumbnail of Screening of Selected Malaysian Herbs as the Potential Broad Spectrum Antimicrobial Agent Against Bacterial Diseases of Fish

Malaysian applied biology, Jun 5, 2021

The control of fish disease is mostly based on synthetic antimicrobial agents. Indiscriminate usa... more The control of fish disease is mostly based on synthetic antimicrobial agents. Indiscriminate usage of antimicrobial agents has resulted in antibiotics resistance. Therefore, the present study aims to evaluate the potential antimicrobial properties of herbal plants as an alternative antimicrobial agent. The susceptibility of fish pathogens namely Bacillus sp., Enterococcus faecalis, Staphylococcus aureus, Streptococcus agalactiae, Aeromonas hydrophila, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Vibrio alginolyticus towards aqueous and methanolic extracts of Cosmos caudatus, Curcuma mangga, Justicia gendarussa, Piper betle and Zingiber zerumbet were assessed using the agar well diffusion, Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) assays. The methanolic extracts were found active against all tested bacteria, compared to aqueous extracts. The best antibacterial activity was demonstrated by methanolic extract of P. betle, followed by Z. zerumbet, C. caudatus, C. mangga and J. gendarussa, with the lowest MIC and MBC values of 0.39 and 1.56 mg/mL, respectively. The methanolic extracts of P. betle and Z. zerumbet also had greater inhibitory effects than some of the commercial antibiotics, particularly tetracycline and erythromycin. Overall findings suggested that the methanolic extracts of P. betle and Z. zerumbet are potential to be developed as new antimicrobial agents to prevent fish bacterial diseases.

Research paper thumbnail of Status and potential of herbal applications in aquaculture: A review

Iranian Journal of Fisheries Sciences, 2015

Disease are recognized as one of the major constraint to sustainable animal production which can ... more Disease are recognized as one of the major constraint to sustainable animal production which can cause significant economic loss especially in aquaculture. Various chemotherapeutic agents have been traditionally used in the treatment and prevention of diseases in farmed fish but they are not recommended since improper and continuous use of antibiotics may lead to potential development of antibiotic resistant bacteria, environmental pollution and accumulation of toxic residues in fish. Therefore, scientists have intensified efforts to exploit natural products such as herbs in developing alternative dietary supplements that enhance growth performance, and health and immune system of cultured fish, as these products are inexpensive, safer, effective, and can be easily prepared and are biodegradable. This review discusses the findings from different studies related to the in-vitro and in-vivo applications of herbs and plant extracts or their combinations, in relation to appetite stimula...

Research paper thumbnail of Antibacterial activities of selected seaweed and seagrass from Port Dickson Coastal Water against different aquaculture pathogens

Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson,... more Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson, respectively, were screened for antibacterial activities. The antibacterial activities were screened using disc diffusion test, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against six aquacultural pathogens strains Aeromonas hydrophila ATCC35654, Vibrio harveyi BB120, Vibrio harveyi ATCC14126, Vibrio alginolyticus ATCC17749, Vibrio parahaemolyticus ATCC17803 and Vibrio anguillarum ATCC43313. The results showed that among all the pathogens, seaweed Padina minor and seagrass Thalassia hemprichii had the strongest antibacterial activity against Vibrio harveyi BB120 and Vibrio harveyi ATCC14126, respectively. The lowest values for minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were obtained from Padina minor against V. harveyi BB120 and Thalassia hemprichii against V. harveyi ATCC14126, respectively. The findings s...

Research paper thumbnail of Assessment of Piper betle L. Methanolic extract as a potential growth and health promoter for juvenile red hybrid tilapia (Oreochromis sp.)

All material contained within the thesis, including without limitation text, logos, icons, photog... more All material contained within the thesis, including without limitation text, logos, icons, photographs and all other artwork, is copyright material of Universiti Putra Malaysia unless otherwise stated. Use may be made of any material contained within the thesis for non-commercial purposes from the copyright holder. Commercial use of material may only be made with the express, prior, written permission of Universiti Putra Malaysia.

Research paper thumbnail of English

Sains Malaysiana, Sep 1, 2015

Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson,... more Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson, respectively, were screened for antibacterial activities. The antibacterial activities were screened using disc diffusion test, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against six aquacultural pathogens strains Aeromonas hydrophila ATCC35654, Vibrio harveyi BB120, Vibrio harveyi ATCC14126, Vibrio alginolyticus ATCC17749, Vibrio parahaemolyticus ATCC17803 and Vibrio anguillarum ATCC43313. The results showed that among all the pathogens, seaweed Padina minor and seagrass Thalassia hemprichii had the strongest antibacterial activity against Vibrio harveyi BB120 and Vibrio harveyi ATCC14126, respectively. The lowest values for minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were obtained from Padina minor against V. harveyi BB120 and Thalassia hemprichii against V. harveyi ATCC14126, respectively. The findings suggested that seaweed and seagrass in Port Dickson coastal water have the potential to prevent bacterial diseases particularly in aquaculture.

Research paper thumbnail of Screening of Selected Malaysian Herbs as the Potential Broad Spectrum Antimicrobial Agent Against Bacterial Diseases of Fish

Malaysian applied biology, Jun 5, 2021

The control of fish disease is mostly based on synthetic antimicrobial agents. Indiscriminate usa... more The control of fish disease is mostly based on synthetic antimicrobial agents. Indiscriminate usage of antimicrobial agents has resulted in antibiotics resistance. Therefore, the present study aims to evaluate the potential antimicrobial properties of herbal plants as an alternative antimicrobial agent. The susceptibility of fish pathogens namely Bacillus sp., Enterococcus faecalis, Staphylococcus aureus, Streptococcus agalactiae, Aeromonas hydrophila, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Vibrio alginolyticus towards aqueous and methanolic extracts of Cosmos caudatus, Curcuma mangga, Justicia gendarussa, Piper betle and Zingiber zerumbet were assessed using the agar well diffusion, Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) assays. The methanolic extracts were found active against all tested bacteria, compared to aqueous extracts. The best antibacterial activity was demonstrated by methanolic extract of P. betle, followed by Z. zerumbet, C. caudatus, C. mangga and J. gendarussa, with the lowest MIC and MBC values of 0.39 and 1.56 mg/mL, respectively. The methanolic extracts of P. betle and Z. zerumbet also had greater inhibitory effects than some of the commercial antibiotics, particularly tetracycline and erythromycin. Overall findings suggested that the methanolic extracts of P. betle and Z. zerumbet are potential to be developed as new antimicrobial agents to prevent fish bacterial diseases.

Research paper thumbnail of Status and potential of herbal applications in aquaculture: A review

Iranian Journal of Fisheries Sciences, 2015

Disease are recognized as one of the major constraint to sustainable animal production which can ... more Disease are recognized as one of the major constraint to sustainable animal production which can cause significant economic loss especially in aquaculture. Various chemotherapeutic agents have been traditionally used in the treatment and prevention of diseases in farmed fish but they are not recommended since improper and continuous use of antibiotics may lead to potential development of antibiotic resistant bacteria, environmental pollution and accumulation of toxic residues in fish. Therefore, scientists have intensified efforts to exploit natural products such as herbs in developing alternative dietary supplements that enhance growth performance, and health and immune system of cultured fish, as these products are inexpensive, safer, effective, and can be easily prepared and are biodegradable. This review discusses the findings from different studies related to the in-vitro and in-vivo applications of herbs and plant extracts or their combinations, in relation to appetite stimula...

Research paper thumbnail of Antibacterial activities of selected seaweed and seagrass from Port Dickson Coastal Water against different aquaculture pathogens

Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson,... more Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson, respectively, were screened for antibacterial activities. The antibacterial activities were screened using disc diffusion test, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against six aquacultural pathogens strains Aeromonas hydrophila ATCC35654, Vibrio harveyi BB120, Vibrio harveyi ATCC14126, Vibrio alginolyticus ATCC17749, Vibrio parahaemolyticus ATCC17803 and Vibrio anguillarum ATCC43313. The results showed that among all the pathogens, seaweed Padina minor and seagrass Thalassia hemprichii had the strongest antibacterial activity against Vibrio harveyi BB120 and Vibrio harveyi ATCC14126, respectively. The lowest values for minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were obtained from Padina minor against V. harveyi BB120 and Thalassia hemprichii against V. harveyi ATCC14126, respectively. The findings s...

Research paper thumbnail of Assessment of Piper betle L. Methanolic extract as a potential growth and health promoter for juvenile red hybrid tilapia (Oreochromis sp.)

All material contained within the thesis, including without limitation text, logos, icons, photog... more All material contained within the thesis, including without limitation text, logos, icons, photographs and all other artwork, is copyright material of Universiti Putra Malaysia unless otherwise stated. Use may be made of any material contained within the thesis for non-commercial purposes from the copyright holder. Commercial use of material may only be made with the express, prior, written permission of Universiti Putra Malaysia.

Research paper thumbnail of English

Sains Malaysiana, Sep 1, 2015

Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson,... more Eight seaweed species in Teluk Kemang and three seagrass species in Teluk Pelanduk, Port Dickson, respectively, were screened for antibacterial activities. The antibacterial activities were screened using disc diffusion test, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against six aquacultural pathogens strains Aeromonas hydrophila ATCC35654, Vibrio harveyi BB120, Vibrio harveyi ATCC14126, Vibrio alginolyticus ATCC17749, Vibrio parahaemolyticus ATCC17803 and Vibrio anguillarum ATCC43313. The results showed that among all the pathogens, seaweed Padina minor and seagrass Thalassia hemprichii had the strongest antibacterial activity against Vibrio harveyi BB120 and Vibrio harveyi ATCC14126, respectively. The lowest values for minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were obtained from Padina minor against V. harveyi BB120 and Thalassia hemprichii against V. harveyi ATCC14126, respectively. The findings suggested that seaweed and seagrass in Port Dickson coastal water have the potential to prevent bacterial diseases particularly in aquaculture.