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Selenium(Se) is a biological essential trace element that affects the growth and health of fish. The present study aimed to explore the dietary Se requirement of triploid rainbow trout using Se‐yeast supplement. The levels of Se added to the basal diet were 0(Se0), 0.1(Se0.1), 0.3(Se0.3), 0.5(Se0.5), 1.0(Se1.0), 4.0(Se4.0) and 16.0(Se16.0) mg Se/kg diet respectively. Results showed that the fish fed...