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<p>This study evaluated the effects of dietary supplementation with <i>Ulva lactuca</i> (5% = ULM5; 10% = ULM10) on Nile tilapia (<i>Oreochromis niloticus</i>) under prolonged intermittent fasting (1&#xa0;week fasting/1&#xa0;week feeding for 12&#xa0;weeks). While fasting reduced growth and body composition parameters, protein content remained above 20% across all groups. ULM5 improved growth performance under normal feeding, whereas ULM10 enhanced antioxidant defense [↑SOD (superoxide dismutase), ↑CAT (catalase), ↓LPO (lipid peroxidation)], particularly during stress. Digestive enzyme activities declined during fasting but recovered in U. lactuca-fed groups. These findings suggest that <i>U. lactuca</i>, especially at 10%, may support physiological resilience and oxidative balance during nutritional stress, highlighting its potential as a functional feed additive in sustainable aquaculture.</p>

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Effects of Ulva lactuca as a dietary supplement on growth, antioxidants and digestive enzymes of Nile tilapia (Oreochromis niloticus) under intermittent fasting and regular feeding regimes in the recirculating system

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Seval Dernekbaşı,
  • Emin Karataş,
  • Keriman Yürüten Özdemir,
  • Dilara Kaya Öztürk,
  • İsmihan Karayücel

摘要

This study evaluated the effects of dietary supplementation with Ulva lactuca (5% = ULM5; 10% = ULM10) on Nile tilapia (Oreochromis niloticus) under prolonged intermittent fasting (1 week fasting/1 week feeding for 12 weeks). While fasting reduced growth and body composition parameters, protein content remained above 20% across all groups. ULM5 improved growth performance under normal feeding, whereas ULM10 enhanced antioxidant defense [↑SOD (superoxide dismutase), ↑CAT (catalase), ↓LPO (lipid peroxidation)], particularly during stress. Digestive enzyme activities declined during fasting but recovered in U. lactuca-fed groups. These findings suggest that U. lactuca, especially at 10%, may support physiological resilience and oxidative balance during nutritional stress, highlighting its potential as a functional feed additive in sustainable aquaculture.