Algal seaweeds have abundant amounts of active substances and can be used as pharmaceuticals and biomedicals in aquafeeds. In this context, the powder of red macroalgae Gracilaria persica was included in the diets of Persian sturgeon at the rate of 0, 2.5, 5, and 10 g/kg to investigate its role on the growth rate, fillet colouration, haemato-biochemical indices, serum, and skin mucus immunity. The weight gain, SGR, and FCR displayed no significant changes in fish fed varying levels of G. persica (P > 0.05). The level of total carotenoids was significantly higher in the blood and fillet of fish fed 5 and 10 g G. persica/kg diet (P < 0.05). Dietary G. persica significantly altered RBCs, WBCs, and HCT at 5, and 10 g/kg, whereas the Hb was increased in fish fed 5 g/kg (P < 0.05). The blood total protein and albumin were significantly increased in fish fed 5 and 10 g/kg (P < 0.05). No significant alterations were observed on ALT, AST, ALP, and glucose levels of fish fed varying levels of G. persica (P > 0.05). Serum Ig, lysozyme, superoxide dismutase, catalase, and respiratory burst activities were increased in fish fed 5, and 10 g/kg than fish fed 0 and 2.5 g/kg diet (P < 0.05). The level of total protein and lysozyme activity in the skin mucus were significantly higher in the blood and fillet of fish fed 5, and 10 g G. persica/kg diet than fish fed 0 and 2.5 g/kg (P < 0.05). Based on the obtained results, G. persica can be used as a feasible feed additive in the diets of Persian sturgeon at 5–10 g/kg diet.

中文翻译：

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膳食江蓠介导波斯鲟（Acipenser persicus）的生长性能、鱼片着色和免疫反应


藻类海藻含有丰富的活性物质，可用作水产饲料中的药物和生物医药。在此背景下，将红藻江蓠粉末以0、2.5、5和10 g/kg的比例添加到波斯鲟饲料中，以研究其对生长速度、鱼片着色、血液生化指标的影响。 、血清和皮肤粘液免疫。饲喂不同水平桃仁的鱼的体重增加、SGR 和 FCR 没有显着变化（P > 0.05）。饲喂5 g和10 g桃仁/kg饲料的鱼血液和鱼片中总类胡萝卜素水平显着升高（P < 0.05）。日粮中5 g/kg和10 g/kg的桃花显着改变了RBC、WBC和HCT，而饲喂5 g/kg的鱼的Hb则增加了（P < 0.05）。饲喂5和10 g/kg后，鱼的血液总蛋白和白蛋白显着增加（P < 0.05）。饲喂不同水平桃仁的鱼的 ALT、AST、ALP 和葡萄糖水平没有观察到显着变化（P > 0.05）。饲喂5、10 g/kg饲料的鱼血清Ig、溶菌酶、超氧化物歧化酶、过氧化氢酶和呼吸爆发活性均高于饲喂0、2.5 g/kg饲料的鱼（P < 0.05）。饲喂5、10 g/kg桃仁的鱼血液和鱼片中总蛋白和皮肤粘液溶菌酶活性显着高于饲喂0、2.5 g/kg的鱼（P < 0.05）。根据所得结果，桃胶可以作为波斯鲟日粮中可行的饲料添加剂，添加量为5~10 g/kg。