Effect of dietary supplementation of Yeast, Garlic and Enzymes on growth performance and economic evaluation in European Eel (Anguilla anguilla) fry

This study was conducted to investigate the effect of feeding three commercial feed additives Tonilisat® (Saccharomyces cerevisiae), Garlin® (26% allicin), Enziver® (Multi-enzymes) and different mixtures of them on growth performance, feed utilization, body composition and cost benefit of European eel (Anguilla anguilla) fry. A total of 160 European eel fry (3.0±0.2 g/fish) were divided into 8 groups (10 fish/tank in two replicates) for 120 days. Eight dietary treatments were conducted as follow: the first diet considered to be the control without any additives. The second and third diets contain 0.2% of Tonilisat® and Garlin®, respectively. The fourth diet contains 0.1% of Enziver®, The fifth diet contains a mixture of 0.1% Tonilisat® with 0.1% Garlin®, the sixth diet contains a mixture of 0.1% e Tonilisat® with 0.05% Enziver®, the seventh diet contains a mixture of 0.1% Garlin® with 0.05% Enziver®, and the eighth diet contains a mixture of 0.1% Tonilisat® , 0.1% Garlin® and 0.05% Enziver®, respectively. The obtained results indicated that growth performance, feed conversion ratio and nutrient utilization were significantly improved in eels fed diet supplemented with multi-enzymes and different mixtures of feed additives. The survival rate (%) and whole body proximate composition didn’t differ significantly among different experimental groups. Meanwhile, the profit index improved significantly with multi-enzyme supplementation and the combinations of yeast, garlic and multienzyme increased diets benfits. Therefore, it’s reasonable to incorporate exogenous multi-enzymes or combination of yeast, garlic and multi-enzyme in the diets of European eels. Keyword: Feed additives, Eel (Anguilla anguilla), Growth performance, feed utilization, economic evaluation. Received: Nov., 15, 2017 Accepted: Feb., 5, 2022