Growth and feed utilization of tilapia (Oreochromis aureus) fed diets containing supplementary enzymes


Yildirim Y. B., Turan F.

Israeli Journal of Aquaculture - Bamidgeh, cilt.62, sa.3, ss.139-145, 2010 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 62 Sayı: 3
  • Basım Tarihi: 2010
  • Dergi Adı: Israeli Journal of Aquaculture - Bamidgeh
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.139-145
  • Anahtar Kelimeler: Exogenous enzyme supplementation, Oreochromis aureus, Tilapia
  • Hatay Mustafa Kemal Üniversitesi Adresli: Evet

Özet

A 90-day feeding trial was conducted to investigate the effects of supplemental exogenous enzymes on growth performance in juvenile tilapia Oreochromis aureus (0.22±0.01 g). A multi-enzyme complex containing fungal xylanase, β-glucanase, pentosonase, α-amilase, fungal β-glucanase, hemicellulase, pectinase, cellulase, and cellubiase was included at levels of 0.0 (control), 0.25, 0.5, and 0.75 g/kg diet in four test diets. After 90 days, survival ranged 94.44-97.22%, with no statistical differences between groups. The growth rate was significantly higher in fish fed supplemented diets than in the control. Tilapia fed the 0.75 g/kg diet had a significantly higher growth rate than those fed the control or 0.25 g/kg diet while the best specific growth rate was observed in the group fed the 0.5 g/kg diet. Likewise, the food conversion ratio, protein efficiency ratio, and apparent net protein utilization were significantly better in the 0.5 and 0.75 g/kg groups than in the control and 0.25 g/kg groups. Protein contents in fish fed the 0.5 and 0.75 g/kg diets were significantly higher than in fish fed the control or 0.25 g/kg diet. The highest protein content (20.08%) was in the 0.75 g/kg group. Results suggest that enzyme supplementation can significantly improve growth performance and feed utilization in juvenile tilapia.