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¹ Fisheries Science Program, Department of Agricultural Science, Faculty of Agriculture Natural Resources and Environment, Naresuan University, Phitsanulok, 65000, Thailand
² Uttaradit Fisheries Provincial Office, Department of Fisheries, Uttaradit 53000, Thailand
³ Department of Aquaculture, Faculty of Fisheries, Kasetsart University, Bangkok, 10900, Thailand
⁴ Department of Animal and Aquatic Science, Faculty of Agriculture, Chiang Mai University, Chiang Mai, 50200, Thailand DOI : 10.4194/AQUAST2201 Viewed : 27 - Downloaded : 24 Fish bio-extracts (FBE) is fermented water from the decomposition of remaining dead fish by microorganisms of semi-anaerobic conditions derived from the Nile tilapia philosopher technique. There are few studies on dietary FBE for practical FBE utilization. Hence, the effect of FBE and feeding duration on growth performance, innate immunity, and disease resistance was investigated for red tilapia. Fish were divided into 5 groups with three replications. The control group was fed the basal commercial diet which was no FBE. The basal commercial diet was incorporated with FBE at 5 ml/kg feeding regimens were evaluated, including i) feeding every day, ii) feeding every other day, iii) feeding every week, and iv) every other week. After 8 weeks of the trial, red tilapia fed with FBE exhibited significantly (p<0.05) better overall parameters, including growth, feed utilization, and innate immunity, compared to the control group. Moreover, the addition of FBE into diets reduced fish mortality after S. agalactiae infection. The highest values were displayed in fish fed with FBE every day. Thus, the administration of FBE at least 5 mL/kg once a day can be used as a growth promoter and a practical disease prophylactic strategy for cultural management in red tilapia farming. Keywords : Bio-extracts Growth promoter Red tilapia Feed additive Disease resistance