Effect of Customized Probiotics on the Physiological and Immunological Responses of Juvenile Western King Prawns (Penaeus latisulcatus Kishinouye, 1896) Challenged with Vibrio harveyi |
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| Authors: | Ngo Van Hai Nicky Buller Ravi Fotedar |
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| Institution: | 1. Department of Environmental and Aquatic Sciences , Curtin University of Technology , Bentley, Western Australia, Australia;2. Research Institute for Aquaculture No. 2 , Ho Chi Minh City, Vietnam ngovanhai@yahoo.com;4. Animal Health Laboratories, Department of Agriculture and Food Western Australia , Western Australia, Australia;5. Department of Environmental and Aquatic Sciences , Curtin University of Technology , Bentley, Western Australia, Australia |
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| Abstract: | Juvenile western king prawn P. latisulcatus were fed 105 colony-forming units (CFU)/mL of two probiotics Pseudomonas synxantha and P. aeruginosa for 28 days. P. latisulcatus were then challenged with V. harveyi at 0 (control), 103, 105, and 107 CFU/mL. During the seven days of challenge, disease resistance of the probiotic-fed prawns was compared with that of prawns not fed probiotics. The immunological responses of the prawns did not improve during the challenge period in terms of total haemocyte count, hyalinocyte, semi-ganulocyte, granulocyte, clotting time, bacteraemia, and intestinal bacterial load. Overall, when prawns were challenged with V. harveyi, the LT50 values got shorter as V. harveyi concentration increased. LT50 values of prawns fed probiotics were significantly longer (P < 0.05) than those not fed probiotics. At a V. harveyi concentration of 103 CFU/mL, the 100% survival of the prawns fed probiotics was three times more likely than those of the prawns not fed probiotics. |
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| Keywords: | Probiotics Pseudomonas spp Vibrio harveyi Western king prawns Penaeus latisulcatus immune responses |
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