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Effects of manganese as growth promotant factor on rainbow trout (Oncorhynchus mykiss)
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Hosein Emadi   , Ali asghar Saeedi , Homayoun Hosseinzadeh Sahafi , Zahra Samavat |
| Islamic Azad University, Tehran, Iran |
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Abstract: (8954 Views) |
| The key to successful aquaculture industry is in the formulation of suitable food formulas containing all necessary elements for growth and improvement of quality in aquatic animals. Rainbow trout is the main Iranian cultivated cold water fish and introducing rations for improving its health and growth, are very important. In this research, 204 rainbow trouts with average initial weight of 50 g received different amounts of manganese sulfate in 4 treatments with 3 repetitions, for 90 days. The amount of manganese sulfate for the treatments 1, 2 and 3, were measured as 48, 78 and 98 mg/kg of food respectively. Treatment 3 had highest increase in growth with 135 g in weight, 7.5 cm in length, with SGR index of 1.66, PER index of 1.62 and FCR index of 1.60. the control group had the lowest increase in growth with 126 g in weight, 5.69 cm in length, and SGR index of 1.41, PER index of 1.56 and highest FCR index of 1.71. the results indicated no significant changes between treatments and controls (P>0.05). There was no significant difference (P>0.05) in survival among treatments. Therefore, despite the increase in growth of rainbow trout with diet containing manganese, but the differences were not significant statistically. |
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| Keywords: Rainbow trout, Manganese Sulfate, Growth promotant |
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Type of Study: Research |
Subject:
Special
Received: 2014/01/29 | Accepted: 2014/01/29 | Published: 2014/01/29
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