University of Guilan Aquatic Animals Nutrition 2980-8499 6 3 2020 10 22 Effects of different levels of dietary butyric acid on some growth performance, immunity and digestive enzymes activity of yellowfin seabream (Acanthopagrus latus Houttuyn, 1782) Effects of different levels of dietary butyric acid on some growth performance, immunity and digestive enzymes activity of yellowfin seabream (Acanthopagrus latus Houttuyn, 1782) 55 67 4860 10.22124/janb.2021.18938.1124 FA Gholamreza Badzohreh Department of Fisheries and Aquaculture, Agricultural and Natural Resources College, Persian Gulf University, Bushehr, Iran; Department of Fisheries, Faculty of Nano and Bioscience and Technology, Persian Gulf University, 0000-0001-9464-1789 Shirin Zarei Department of Fisheries, Faculty of Marine Science and Technology, Persian Gulf University, Bushehr, Bushehr, Iran Reza Davoodi Department of Fisheries and Aquaculture, Agricultural and Natural Resources College, Persian Gulf University, Bushehr, Iran; Department of Fisheries, Faculty of Nano and Bioscience and Technology, Persian Gulf University, Mahmoud Nafisi Bahabadi Department of Fisheries and Aquaculture, Agricultural and Natural Resources College, Persian Gulf University, Bushehr, Iran; Department of Fisheries, Faculty of Nano and Bioscience and Technology, Persian Gulf University, Bushehr, Bushehr, Iran Farzad Salehi Department of Fisheries and Aquaculture, Agricultural and Natural Resources College, Persian Gulf University, Bushehr, Iran; 2- Department of Fisheries, Faculty of Nano and Bioscience and Technology, Persian Gulf University, Bushehr, Bushehr, Iran Vahid Morshedi Department of Fisheries and Biology, Persian Gulf Research Institute, Persian Gulf University, Bushehr, Iran Ebrahim Sotoudeh Department of Fisheries and Aquaculture, Agricultural and Natural Resources College, Persian Gulf University, Bushehr, Iran; Department of Fisheries, Faculty of Nano and Bioscience and Technology, Persian Gulf University, Bushehr, Bushehr, Iran Journal Article 2020 05 04 This study was conducted to evaluate the effects of different dietary levels of butyric acid on growth performance, immunity and digestive enzyme activities in yellowfin seabream (<em>Acanthopagrus</em> <em>latus</em>) (8.59 ± 0.33 g) at the period of 60 days. After 2-week adaptation, 120 fish with a density of 10 fish/tank in a completely randomized design were distributed to 12 tanks. Fish were fed with 4 levels of butyric acid including zero (control), 2.5 (T₁), 5 (T₂) and 10 g/kg (T₃) of diet 2 times per day. The results showed that different levels of butyric acid in diet had significant effects on growth performance and nutritional indices compared to the control (p<0.05). However, protein productive value of T₁ and control exhibited no significant difference (p>0.05). The food conversion ratio in control group was significantly higher than in the other treatments (p<0.05). Nonspecific immune responses, lysozyme activity and ACH50 in T₃ were also significantly higher than in the other treatments (p<0.05). Protease activity in T₃ and also amylase in T₂ and T₃ were significantly increased compared to the control (p<0.05), whereas lipase activity did not exhibit any significant difference (p>0.05). In conclusion, butyric acid, especially at the level of 10 g/kg of diet, displayed positive effects on the growth, immune indices and enzyme activities in yellowfin seabream. This study was conducted to evaluate the effects of different dietary levels of butyric acid on growth performance, immunity and digestive enzyme activities in yellowfin seabream (<em>Acanthopagrus</em> <em>latus</em>) (8.59 ± 0.33 g) at the period of 60 days. After 2-week adaptation, 120 fish with a density of 10 fish/tank in a completely randomized design were distributed to 12 tanks. Fish were fed with 4 levels of butyric acid including zero (control), 2.5 (T₁), 5 (T₂) and 10 g/kg (T₃) of diet 2 times per day. The results showed that different levels of butyric acid in diet had significant effects on growth performance and nutritional indices compared to the control (p<0.05). However, protein productive value of T₁ and control exhibited no significant difference (p>0.05). The food conversion ratio in control group was significantly higher than in the other treatments (p<0.05). Nonspecific immune responses, lysozyme activity and ACH50 in T₃ were also significantly higher than in the other treatments (p<0.05). Protease activity in T₃ and also amylase in T₂ and T₃ were significantly increased compared to the control (p<0.05), whereas lipase activity did not exhibit any significant difference (p>0.05). In conclusion, butyric acid, especially at the level of 10 g/kg of diet, displayed positive effects on the growth, immune indices and enzyme activities in yellowfin seabream. https://janb.guilan.ac.ir/article_4860_5c4148b77e8a48d39de50fdc9e11e46f.pdf