Impact of Sodium Bicarbonate-Enriched Diet on Muscle pH and Quality of Rainbow Trout (Oncorhynchus mykiss) During Cold Storage

Abstract

The effect of sodium bicarbonate (SB) supplementation to fish feed on the quality characteristics of rainbow trout (Oncorhyncus mykiss) under post-harvest cold storage conditions was investigated in this study. Rainbow trout fed with 0, 1M, 2M and 3M SB supplemented diets for 21 days before harvesting were stored at 4°C. The highest post-harvest pH level was observed in the group fed with 2M and 3M SB. TVB-N value was found between 14.88-15.68 mg/100g in fish fed with 1M, 2M and 3M SB supplemented diets, while it was determined as 20.14 mg/100g for the control group. At the beginning of storage, similar TBARs values were observed in all groups; however the increase in TBARs in the groups fed with SB supplemented feeds was slower than in the control. Sensory scores of trout fed with SB supplemented diets at the beginning of storage were higher than those of the control group. However, no difference was determined between the groups regarding shelf life (13 days). The best texture scores were observed in the 3M group throughout the storage period. Therefore, it can be concluded that SB addition to pre-harvest rainbow trout feeds can be used as a feed supplements to improve fish flesh quality.

Keywords

• Sodium bicarbonate
• rainbow trout
• pH
• cold storage
• post-harvest quality

Sodyum Bikarbonatla Zenginleştirilmiş Diyetin Soğukta Depolama Sırasında Gökkuşağı Alabalığının (Oncorhyncus mykiss) Kas pH'ı ve Kalitesi Üzerine Etkisi

Öz

Bu araştırmada balık yemlerine sodyum bikarbonat (SB) ilavesinin gökkuşağı alabalığının (Oncorhyncus mykiss) hasat sonrası soğuk depolama koşullarında kimyasal ve duyusal özelliklerine etkisi araştırılmıştır. Hasattan önce 21 gün boyunca 0, 1M, 2M ve 3M SB katkılı yemlerle beslenen gökkuşağı alabalığı 4°C'de depolanmış, raf ömrü sonuna kadar kimyasal ve duyusal değerlendirmeler yapılmıştır. Hasat sonrası en yüksek pH düzeyi 2M ve 3M SB katkılı yemlerle beslenen grupta gözlenmiştir. TVB-N değeri 1M, 2M ve 3M SB katkılı yemlerle beslenen gökkuşağı alabalığında 14,88-15,68 mg/100g arasında bulunurken, kontrol grubunda 20,14 mg/100g olarak belirlenmiştir. Depolamanın başlangıcında tüm gruplarda benzer TBARs değerleri gözlenmiş; ancak SB katkılı yemlerle beslenen gruplarda TBARs artışının kontrole göre daha yavaş olduğu görülmüştür. Depolama başlangıcında SB katkılı yemlerle beslenen alabalıkların görünüm, koku, tekstür, renk ve genel kabul edilebilirlik puanları kontrol grubuna göre daha yüksek bulunmuştur. Ancak raf ömrü (13 gün) açısından gruplar arasında fark gözlenmemiştir. Tüm depolama süresi boyunca en iyi doku skorları 3M grubunda gözlemlenmiştir. Bu nedenle, hasat öncesi gökkuşağı alabalığı yemlerine SB ilavesinin et kalitesini artırmak amacıyla yem katkı maddesi olarak kullanılabileceği sonucuna varılabilir.

Anahtar Kelimeler

• Sodyum bikarbonat
• gökkuşağı alabalığı
• pH
• soğuk depolama
• hasat sonrası kalite

Kaynakça

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