Effects of total replacement of dietary fish oil by vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum -and high temperature conditions

Seval Dernekbaşı; Ayşe Parlak Akyüz; İsmihan Karayücel

doi:10.12714/egejfas.38.2.14

TR EN

Yemdeki balık yağının bitkisel yağlarla tamamen değiştirilmesinin optimum ve yüksek su sıcaklığında beslenen gökkuşağı alabalığının (Oncorhynchus mykiss) büyüme performansı, besin kalitesi ve yağ asidi profili üzerine etkileri

Öz

Bu çalışmada, balık yağının farklı bitkisel yağlarla toplam ikamesinin, optimum ve yüksek sıcaklık koşullarında gökkuşağı alabalığının (Oncorhynchus mykiss) büyüme performansı, beslenme kalitesi ve yağ asidi profilleri üzerindeki etkileri araştırılmıştır. Ortalama 11.27 ± 0.01 g ağırlıktaki gökkuşağı alabalığı yavruları için %100 balık yağı ve bitkisel yağlardan oluşan beş izo-nitrojenli ve izo-lipidik diyet hazırlanmıştır. Balıklar optimum sıcaklıkta (17.74±0.01°C) 9 hafta deneysel diyetlerle beslendikten sonra, tüm gruplara optimum üstü sıcaklık koşullarında (19.28±0.11°C) 4 hafta boyunca sadece balık yağı içeren bir FO (kontrol) diyeti verilmiştir. Her iki besleme denemesinde de deneysel balıklar günde iki kez elle doyuncaya kadar beslenmiştir. Sonuçlar, optimum sıcaklıkta FO bazlı diyetle beslenen gruplara kıyasla, VO bazlı diyetlerle beslenen gruplarda büyüme performansı ve yemleme veriminin önemli ölçüde daha iyi (p <0.05) olduğunu göstermiştir. Yaşama oranı, 9 hafta sonunda CANO, SFO, CO PNO gruplarında %100 ve FO (kontrol) grubunda % 94.12 ± 3.39 olarak tespit edilmiştir. Optimum sıcaklıkta beslenen balıkların büyümesi, yem tüketimi ve hayatta kalması önemli ölçüde farklılık göstermiştir (p <0.05). Özellikle bitkisel yağ bazlı diyetlerle optimum sıcaklıkta beslenen ve daha sonra sadece balık yağı ile beslenen grupların hayatta kalma oranı %100 kalırken, kontrol grubunda bu oran %54.17±1.39'a gerilemiştir. VO bazlı diyetlerle beslenen balıkların eikosapentaenoik asit (EPA, 20:5n-3), dokosaheksaenoik asit (DHA, 22:6n-3) ve n-3 PUFA düşük olduğu tespit edilmiştir. Tüm gruplara optimum sıcaklıklarda 4 hafta boyunca sadece FO diyeti verildiğinde EPA, DHA ve n-3 PUFA oranları artmıştır. Ayrıca optimum üst sıcaklık denemesinin ardından balık etinin besin kalitesi endekslerinde de artışlar tespit edilmiştir.

Anahtar Kelimeler

Effects of total replacement of dietary fish oil by vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum -and high temperature conditions

Abstract

The present study investigated the effects of total replacement of dietary fish oil by different vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum -and high temperature conditions. Five iso-nitrogenous and iso-lipidic diets including 100% fish oil and vegetable oils were prepared for rainbow trout fingerlings with an average weight of 11.27±0.01 g. After the fish were fed experimental diets for 9 weeks at the optimum temperature (17.74 ± 0.01 ° C), all groups were fed an FO diet containing only fish oil for 4-weeks at the upper optimum temperature conditions (19.28 ± 0.11°C). In both feeding trials, experimental fish were hand-fed ad libitium twice a day. Results showed that growth performance and feeding efficiency were significantly better (p<0.05) in groups fed by VO-based diets compared to groups fed by FO based diet at optimum temperature. Survival was 100% in CANO, SFO, CO PNO groups and 94.12 ± 3.39% in FO (control) group at the end of the 9 weeks. Growth, feed consumption and survival of fish fed the upper-optimum temperature were significantly differed (p<0.05). In particular, while the survival rate of the groups fed with vegetable oil-based diets at optimum temperature and then fed only fish oil remained 100%, this rate decreased to 54.17 ± 1.39% in the control group. Eicosapentaenoic acid (EPA, 20:5n-3), docosahexaenoic acid (DHA, 22:6n-3) and n-3 PUFA of fish fed by VO based diets were low. When all groups were fed only FO diet for 4 weeks at upper-optimum temperatures, EPA, DHA and n-3 PUFA ratios increased. In addition, after the upper-optimum temperature trial, increases in the nutritional quality indices of fish meat were also detected.

Keywords

Thanks

This study was conducted at the Research and Application Center of the Aquaculture and Fisheries Faculty of Sinop University, Turkey. We extend our gratefulness to Osman PARLAK, the Owner of the Kuzey Su Urunleri fish farm, for providing us the fish.

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Details

Primary Language

English

Subjects

Food Engineering

Journal Section

Research Article

Authors

Seval Dernekbaşı ^*
0000-0001-5735-2486
Türkiye

Ayşe Parlak Akyüz
Türkiye

İsmihan Karayücel
Türkiye

Publication Date

June 15, 2021

Submission Date

November 17, 2020

Acceptance Date

March 18, 2021

Published in Issue

Year 1970 Volume: 38 Number: 2

DOI

https://doi.org/10.12714/egejfas.38.2.14

IZ

https://izlik.org/JA82FX82ZR

Cite

RIS / Bibtex

APA

Dernekbaşı, S., Parlak Akyüz, A., & Karayücel, İ. (2021). Effects of total replacement of dietary fish oil by vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum -and high temperature conditions. Ege Journal of Fisheries and Aquatic Sciences, 38(2), 237-246. https://doi.org/10.12714/egejfas.38.2.14

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