Volume 4, Issue 1 (2015)                   JFST 2015, 4(1): 43-52 | Back to browse issues page

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dehghan E, Keramat A, Oraji H, jani Khalili K. Effect of body weight and different level of feeding on growth performance, carcass composition and digestibility of rainbow trout (Oncorhynchu smykiss). JFST 2015; 4 (1) :43-52
URL: http://jfst.modares.ac.ir/article-6-3357-en.html
Effect of body weight and different level of feeding on growth performance, carcass composition and digestibility of rainbow trout (Oncorhynchu smykiss)
Elham Dehghan * 1, Abdolsamad Keramat2 , Hossein Oraji1 , Khosro Jani Khalili1
1- Agricultural Sciences and Natural Resources University
2- Sari Agriculture Sciences and Natural Resources University
Abstract:   (9513 Views)
The present study was to evaluate the impact of feeding level and fish size on the growth factors,carcass composition and digestibility of rainbow trout. Six experimental treatments were assigned by the use of three feeding levels (maintenance, medium and satiation levels) and two fish sizes (43.02 ± 2.93 and 231.32± 6.74g) according to a 3×2 factorial design.  There were three replicates for each treatment and the experiment lasted for 59 days. The results showed that there is a significant interaction effect between fish size and feeding level for body weight gain, final body weight and specific growth (p<0.05). Body composition (dry matter, energy, moisture, fat and protein) was affected by feeding level and size of the fish (p<0.05). However, the interaction effect between fish size and feeding level for body composition was not significant (p>0.05).The digestibility measurements showed that fish size and feeding level  changed  significantly digestibility of protein, lipid, energy and dry matter in rainbow trout (p<0.05). Maximum growth at satiation feeding level can reduce feed conversion ratio and increase waste production at both fish sizes.
Keywords: maintenance, Satiation, Specific growth rate, Digestibility, Rainbow trout
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Article Type: Research Article | Subject: Fis nutrition
Received: 2014/06/23 | Published: 2015/05/22
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