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¹ Sinop University, Scientific and Technological Research Application and Research Center (SUBİTAM), TR57000, Sinop, Türkiye
² Recep Tayyip Erdoğan University, Faculty of Fisheries and Aquaculture, TR53000, Rize, Türkiye
³ Sinop University, Faculty of Fisheries and Aquaculture, TR57000, Sinop, Türkiye DOI : 10.4194/TRJFAS26512 Viewed : 113 - Downloaded : 93 This study was conducted to evaluate the effect of dietary inclusion of green tea powder on growth performance, feed utilization and body composition of rainbow trout. A total of 546 fish with an average body weight of 40.4±0.01 g were divided in the seven experimental treatments. The fish were fed with diets containing 0%(control), 0.25%(diet1), 0.5%(diet2), 1%(diet3), 2%(diet4), and 3%(diet5) of dried green tea (GT) powder containin 5.3±0.04% epigallocatechin gallate-3-gallate (EGCG), 1%(diet6) green tea dust (GTD) containing 6.5±0.07% EGCG for 60 days. Fish fed with diet 2 had higher weight gain, specific growth rate, apparent net protein retention, and protein efficiency ratio than other groups, and had a lower feed conversion ratio than other groups, but not significantly changed than control group (P>0.05). Crude lipid content of liver and fillet in fish fed experimental diets were significantly lower than of fish fed the control diet (P<0.05). These results showed that dietary supplementation of GT powder in trout feed promoted the growth performance and feed utilization, and also administration of 1% level of GTD and different doses of GT powder in the experimental diets showed lipid-lowering effects for rainbow trout. Keywords : Green tea Rainbow trout Growth performance Feed utilization Hypolipidemic