Role of dietary Mannan Oligosaccharides supplementation in diets on growth performance and feeding efficiency of Rainbow trout (Oncorhynshus mykiss) fry

The present study was performed to elucidate the probable effects of prebiotic Mannan Oligosaccharides supplementation in diets on growth performance and feed efficiency of rainbow trout fry. 1500 fish with average weight of 110±10 mg were distributed into 12 (35 L) tanks (125 fish/tank) and cultured for 60 days using experimental diets. Fish diet was used by prebiotic supplementation at three levels of 0.5, 1, and 2 g/kg along with a control diet. The results showed that final weight significantly increased in fish fed 0.5, 1 and 2 g/kg (Final weight: 2.03±0.11, 2.61±0.69 and 2.57±0.04 gr, respectively) Mannan prebiotic supplementation were significantly higher than the control group (Final weight: 1.67±0.05 gr). However, feed conversion ratio in fish fed 0.5, 1 and 2 g/kg Mannan prebiotic supplementation were significantly lower than the control group (P<0.05). The use of 1g/kg dietary Mannan Oligosaccharides prebiotic improved the growth parameter and feed efficiency ratio in rainbow trout fry.