title: Protective effect of herbal and probiotics enriched diet on haematological and immunity status of Oplegnathus fasciatus (Temminck & Schlegel) against Edwardsiella tarda.
abstract: This study determines the effect of diet enriched with the herb Baical skullcap Scutellaria baicalensis, and/or probiotics Lactobacillus sakei BK19 in rock bream, Oplegnathus fasciatus (32 ± 3 g) against Edwardsiella tarda. The changes in haematological parameters, innate immune response, and disease resistance were investigated after 1, 3, and 6 weeks. The white blood cell count (WBC: 10(4) mm(-3)), red blood cell count (RBC: 10(6) mm(-3)), and haemoglobin (Hb: g dl(-1)) levels significant increased (P < 0.05) with mixed diet on 3rd and 6th week and probiotics enriched diet on 6th week. The haematocrit (Ht: %) level significantly increased (P < 0.05) when fed with mixed diet on weeks 1-6. Interestingly, in mixed diet group the lymphocytes (LYM), monocytes (MON), and neutrophils (NEU) significantly increased from week 1-6. The eosinophils (EOS) significantly increased in all the treated groups. In the probiotics or mixed diet groups the total protein (TP: g dl(-1)) increased significantly on weeks 3 and 6. The serum lysozyme activity significantly was enhanced in all the treated groups indicating an increase in the innate immunity level. Serum complement, antiprotease activities, reactive oxygen species (ROS) and reactive nitrogen species (RNS) production significantly increased from week 1-6 with mixed diet. The maximum protection against E. tarda was recorded in mixed diet group with a minimum cumulative mortality of 20% and a high relative percent survival (RPS) of 72.84. In the probiotics and herbal diet groups the cumulative mortality was 25% and 35% and RPS was 68.63 and 59.42, respectively. This study indicates that administration of probiotics or mixed diets can effectively minimize the mortality and restore the altered hematological parameters and enhancing the innate immunity in O. fasciatus against E. tarda.
authors.affiliation: Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University, Jeju 690-756, South Korea. rhari123@yahoo.com
authors.forename: Ramasamy
authors.initials: R
authors.lastname: Harikrishnan
authors.forename: Man-Chul
authors.initials: MC
authors.lastname: Kim
authors.forename: Ju-Sang
authors.initials: JS
authors.lastname: Kim
authors.forename: Chellam
authors.initials: C
authors.lastname: Balasundaram
authors.forename: Moon-Soo
authors.initials: MS
authors.lastname: Heo
mesh_terms: D000818:Animals; D003165:Complement System Proteins / Q000276:immunology; D004032:Diet / Q000662:veterinary*; D020609:Edwardsiella tarda / Q000276:immunology; D004756:Enterobacteriaceae Infections / Q000276:immunology / Q000401:mortality / Q000662:veterinary*; D005393:Fish Diseases / Q000276:immunology* / Q000401:mortality; D009113:Muramidase / Q000097:blood; D010473:Perciformes / Q000097:blood* / Q000276:immunology*; D019936:Probiotics / Q000008:administration & dosage*; D011480:Protease Inhibitors / Q000097:blood; D026361:Reactive Nitrogen Species / Q000097:blood; D017382:Reactive Oxygen Species / Q000097:blood; D031364:Scutellaria baicalensis / Q000276:immunology*
chemical_list: D011480:Protease Inhibitors; D026361:Reactive Nitrogen Species; D017382:Reactive Oxygen Species; D003165:Complement System Proteins; D009113:Muramidase