Dernekbasi, SevalKaratas, EminOzdemir, Keriman YurutenOzturk, Dilara KayaKarayucel, Ismihan2026-04-252026-04-2520250921-89711573-5176https://doi.org/10.1007/s10811-025-03659-xhttps://hdl.handle.net/11486/8198This 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 [up arrow SOD (superoxide dismutase), up arrow CAT (catalase), down arrow 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.eninfo:eu-repo/semantics/closedAccessUlva lactucaOreochromis niloticusEnzymeAntioxidantsFeeding regimeEffects 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 systemArticle3764705471810.1007/s10811-025-03659-xQ1WOS:001581941700001Q10000-0001-5735-24860000-0003-2505-231X0000-0002-7483-6543