Digestibility and liver fatty acid composition of Rainbow trout (Oncorhynchus mykiss) fed by graded levels of canola oil

Bu çalışmada, yemlere farklı oranlarda ilave edilen kanola yağının gökkuşağı alabalıklarında karaciğer yağ asitleri kompozisyonu, hepatosomatik indeks, viserosomatik indeks ve sindirilebilirliğe etkisinin belirlenmesi amaçlanmıştır. Gökkuşağı alabalıkları 70 gün süre ile deneme rasyonları ile beslenmişlerdir. Rasyonlar balıklara görülebilir doygunluk sınırına erişinceye kadar günde iki kez verilmiştir. Deneme rasyonları arasında yağ ve protein sindiriminde önemli farklılıklar yoktur. VSI ve HSI’de deneme başlangıcı ve sonunda tüm gruplar arasında farklılığa rastlanmamıştır (P>0.05). Bütün grupların karaciğer yağ asitleri içerikleri birbirinden farklı tespit edilmiştir. Karaciğer yağ asidi analizi, deneme başlangıcı karaciğer örneklerinde ve balık yağı ilaveli rasyonla beslenen balıklarda n-3 HUFA’lardan EPA ve DHA, kanola yağı ilaveli rasyonlarla beslenen balıklarda ise oleik (C18:1n-9, OA) ve linoleik (C18:2n-6, LA) asitlerin daha yüksek olduğunu göstermiştir. Araşidonik asit (C20:4n-6; ARA) C75, K, C100, C50 grupları ve başlangıç örneklerinde sırasıyla %2.54, 3.15, 4.15, 4.63 and 5.64 olarak belirlenmiştir. n3/n6 oranları ise tüm gruplarda oldukça yüksek tespit edilmiştir.

Anahtar Kelimeler:

gökkuşağı alabalığı, yağ asitleri, kolza tohumu yağı, karaciğer, sindirilebilirlik

Farklı oranlarda kanola yağıyla beslenen gökkuşağı alabalığı’nın (Oncorhynchus mykiss) karaciğer yağ asit kompozisyonu ve sindirilebilirliği

This study was aimed to determined the effects of different concentrations of canola oil (CO) on the digestibility, vicerosomatic index (VSI), hepatosomatic index (HSI) and the contents of fatty acids in the liver of rainbow trout (Oncorhynchus mykiss). Rainbow trouts were fed with the experimental diets for 70 days. The diets were given as triplicate groups of rainbow trout (initial weight of 119 g) to apparent satiation twice in a day. There were not significant differences in digestibility of protein and lipid between the experimental diets. VSI and HSI were not significantly different among the all treatment and between the initals and the end of trials (P>0.05). Liver fatty acid contents of all groups were different from each other. Liver fatty acid analyses showed that EPA and DHA from n-3 HUFA’s in the fish fed by the fish oil diet (K) and the initial liver samples, oleic acid (C18:1n-9, OA) and linoleic acid (C18:2n-6, LA) in the fish fed by the canola oil (C50, C75, C100) were higher than in the fish fed by the control diet. Arachidonic acid (C20:4n-6; ARA) were 2.54, 3.15, 4.15, 4.63 and 5.64% in C75, K, C100, C50 groups and initial, respectively. n3/n6 rate was quite high in all groups.

Keywords:

rainbow trout, fatty acids, rapeseed oil, liver, digestibility,

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