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Effects of dietary fish meal replacement with Yeast (Saccharomyces cervisiae) on growth and feeding indices rainbow trout (Oncorhynchus mykiss)
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Asghar Khosravi Farsani *   , Iraj Hashemzadeh2 , Esmaeil Pirali2 |
Department of Fisheries and Environment, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran, Department of Fisheries and Environment, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran , Asgharkhosravi69@gmail.com
2- Department of Fisheries and Environment, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran |
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Abstract: (1973 Views) |
| In this study the effects of replacing fish meal with yeast (Saccharomyces cerevisiae) on feeding and growth in rainbow trout (Onvorhynchus mykiss) fry were analyzed. The experiments of this study were conducted for a period of 10 weeks during summer 2019 in a fish farm located in Chahar-Mahal and Bakhtiari Province (Iran). In treatments used in this study, different ratios of fish meal and yeast were used in production of experimental fish food plates: 1) only fish meal, 2) 66% fish meal and 33% yeast, 3) 66% yeast and 33% fish meal, and 4) only yeast. Based on the results of this study the first two treatments in which only fish meal and 66% fish meal plus 33% yeast were included as animal protein sources were significantly better compared to the 3rd and 4th treatments regarding growth indices (mean final weight, specific growth rate, and condition factor). There were no significant differences observed among treatments for hepatosomatic and visceral indices (P>0.05). The best food conversion ratio (FCR), protein efficiency ratio, and food efficiency were observed in treatments 1 and 2, which differed significantly from other treatments (P<0.05). The total feed consumption by each individual and the total daily food consumption were not significantly different among treatment used in this study (P>0.05). In conclusion, it can be proposed that replacement of 25-50% fish meal with yeast in fish feed plates can provide a more economic fish food. |
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| Keywords: Fishmeal, Sigle Cell Protein, Saccharomyces cerevisiae, Growth, Feed, Oncorhynchus mykiss |
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Full-Text [PDF 705 kb]
(557 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2020/05/6 | Accepted: 2020/10/4 | Published: 2021/12/31
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