MURAT ARSLAN, Necdet SİRKECİOĞLU, Abdulkadir BAYIR, HARUN ARSLAN, Mevlüt ARAS

The influence of substitution of dietary Fish oil with different vegetable oils on performance and fatty acid composition of brown trout, Salmo trutta

Mevcut çalışmada yaklaşık 1 g ağırlığındaki kahverengi alabalık yavruları 6 hafta süre ile kazein-jelâtin tabanlı yemlerle beslenmiştir. Yemlerde yağ kaynağı olarak balık (ringa) yağı (MO diyeti), fındık yağı (HO diyeti), soya yağı-keten tohumu yağı karışımı (1:1) (LO+SO diyeti) ve soya lesitini (LE diyeti) kullanılmıştır. Kapalı devre su sisteminde yürütülen çalışma boyunca sıcaklık 13±0,2°C olarak gerçekleşmiştir. Çalışma sonunda LO+SO yemi ile beslenen balıklar diğer yemlerle beslenen balıklara göre önemli derecede yüksek büyüme performansı göstermiştir (P

Balık yağı yerine kullanılan farklı diyetsel bitkisel yağların kahverengi alabalık (salmo trutta) yavrularında büyüme ve yağ asidi kompozisyonuna etkisi

Brown trout Salmo trutta (~1 g) were fed four casein-gelatin based diets with different lipid resources for 6 weeks. The sources of dietary lipid were menhaden oil (MO diet), hazelnut oil (HO diet,), a blend of linseed oil and soybean oil (1:1) (LO+SO diet), and soybean lecithin (LE diet). Feeding trial was conducted in a recirculating water system at 13±0.2°C. Fish fed LO+SO diet demonstrated the highest growth performance while those fed HO diet had the lowest growth rate (P<0.05). The fatty acid profiles of fish reflected the fatty acid composition of the diets. High level of docosahexaenoic acid (22:6n-3, DHA) in whole body lipids of fish fed LO+SO diet corresponded with the high level of linolenic acid (18:3n-3, LNA) in the lipids of this diet. Fish fed LE diet which was rich in linoleic acid (18:2n-6, LA) had the highest level of arachidonic acid (20:4n-6 , ARA) in their body. The results suggest that the efficiency of elongation and desaturation of C18 fatty acids depends on the dietary lipid source and brown trout has capacity to transform LA and LNA to ARA and DHA, respectively. Growth depletion in fish fed HO diet might be caused by essential fatty acid deficiency.

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