Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens

Short-chain organic acids have the potential to be viable alternatives to antibiotics by acting as a prophylatic to bacterial disease and enhance fish performance. To test this, three related experiments were set up. The first part of the research was designed to determine the antibacterial effects...

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Main Author:	Koh, Chik Boon
Format:	Thesis
Language:	English
Published:	2013
Subjects:	QH1 Natural history (General - Including nature conservation geographical distribution)
Online Access:	http://eprints.usm.my/43539/1/Koh%20Chik%20Boon24.pdf
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id	my-usm-ep.43539
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spelling	my-usm-ep.435392019-04-12T05:26:10Z Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens 2013-09 Koh, Chik Boon QH1 Natural history (General - Including nature conservation, geographical distribution) Short-chain organic acids have the potential to be viable alternatives to antibiotics by acting as a prophylatic to bacterial disease and enhance fish performance. To test this, three related experiments were set up. The first part of the research was designed to determine the antibacterial effects of various organic acids on Aeromonas hydropilia, in order to develop a tailor-made organic acid blend (OAB). The OAB was then compared with a commercial organic acid product, potassium diformate (KDF) and commonly used antibiotic, oxytetracycline (OTC) on in vitro antibacterial activities to A. hydrophila and Streptococcus agalactiae. All the tested organic acids could completely inhibit A. hydrophila at a concentration of 0.3% or lower. Among the acids, formic acid was the most effective followed by tartaric acid, lactic acid, propionic acid, citric acid and malic acid. The OAB had stronger antimicrobial activity than KDF or OTC when used at 0.2% or higher. It also showed strong bactericidal activity against S. agalactiae. In the second part of the research, two feeding trials were conducted to investigate the practical applications of dietary organic acids in the aquaculture industry. In the second experiment, a 14-week feeding trial was conducted to determine the effects of dietary OAB. The experimental diets were added with 0, 1, 2 or 3 g kg-1 of OAB, or with 2 g kg-1 of KDF and fed to triplicate groups of red hybrid tilapia (Oreochromis sp.). Upon completion, tilapia were challenged by immersion with S. agalactiae. Results showed no significant differences (P>0.05) to growth or nutrient utilization, although a slight improvement was observed for tilapia fed the acidified diets. 2013-09 Thesis http://eprints.usm.my/43539/ http://eprints.usm.my/43539/1/Koh%20Chik%20Boon24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Kajihayat
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QH1 Natural history (General - Including nature conservation geographical distribution)
spellingShingle	QH1 Natural history (General - Including nature conservation geographical distribution) Koh, Chik Boon Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
description	Short-chain organic acids have the potential to be viable alternatives to antibiotics by acting as a prophylatic to bacterial disease and enhance fish performance. To test this, three related experiments were set up. The first part of the research was designed to determine the antibacterial effects of various organic acids on Aeromonas hydropilia, in order to develop a tailor-made organic acid blend (OAB). The OAB was then compared with a commercial organic acid product, potassium diformate (KDF) and commonly used antibiotic, oxytetracycline (OTC) on in vitro antibacterial activities to A. hydrophila and Streptococcus agalactiae. All the tested organic acids could completely inhibit A. hydrophila at a concentration of 0.3% or lower. Among the acids, formic acid was the most effective followed by tartaric acid, lactic acid, propionic acid, citric acid and malic acid. The OAB had stronger antimicrobial activity than KDF or OTC when used at 0.2% or higher. It also showed strong bactericidal activity against S. agalactiae. In the second part of the research, two feeding trials were conducted to investigate the practical applications of dietary organic acids in the aquaculture industry. In the second experiment, a 14-week feeding trial was conducted to determine the effects of dietary OAB. The experimental diets were added with 0, 1, 2 or 3 g kg-1 of OAB, or with 2 g kg-1 of KDF and fed to triplicate groups of red hybrid tilapia (Oreochromis sp.). Upon completion, tilapia were challenged by immersion with S. agalactiae. Results showed no significant differences (P>0.05) to growth or nutrient utilization, although a slight improvement was observed for tilapia fed the acidified diets.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Koh, Chik Boon
author_facet	Koh, Chik Boon
author_sort	Koh, Chik Boon
title	Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
title_short	Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
title_full	Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
title_fullStr	Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
title_full_unstemmed	Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens
title_sort	effects of dietary organic acids on growth performance of red hybrid tilapia, oreochromis sp., and inhibition of selected fish pathogens
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Kajihayat
publishDate	2013
url	http://eprints.usm.my/43539/1/Koh%20Chik%20Boon24.pdf
_version_	1747821235912310784

Effects Of Dietary Organic Acids On Growth Performance Of Red Hybrid Tilapia, Oreochromis Sp., And Inhibition Of Selected Fish Pathogens

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