This study was conducted to determine the effects of different dietary lipid sources on red swamp crayfish (Procambarus clarkii). Six diets were formulated with the same lipid level (85 g/kg) to contain fish oil (FO), soybean oil (SO), corn oil (CO), palm oil (PO), lecithin oil (LO) and pork lard (PL) respectively. Each diet was fed to triplicate of 18 crayfish with an initial weight of (13.05 Â± 0.60) g for 8 weeks. The results showed that crayfish fed diet SO had a significantly higher weight gain rate and specific growth rate than those fed diet CO, PO and PL, but there was no significant difference among crayfish fed diet FO, SO and LO. Crayfish fed diet PL had the highest feed conversion ratio and the lowest survival rate. Significantly increased muscle lipid contents were observed in groups PO and PL compared with other groups. Group FO had the highest values of EPA, DHA and n-3/n-6 ratio in muscle, followed by groups LO and SO. The haemolymph triacylglycerol content was the highest, whereas alkaline phosphatase activity was the lowest in crayfish fed diet PL. Moreover, a significant increase of total protein content was observed in the haemolymph of crayfish fed diet FO, SO and LO. In conclusion, crayfish fed diet FO, SO and LO showed better growth than those fed diet PL and PO without any signs of essential fatty acid deficiency.

中文翻译：

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脂源对红沼泽小龙虾（Procambarus clarkii）生长性能、肌肉成分、血淋巴生化指标和消化酶活性的影响

本研究旨在确定不同膳食脂质来源对红沼泽小龙虾 ( Procambarus clarkii ) 的影响。）。六种日粮采用相同的脂质水平（85 g/kg）配制，含有鱼油（FO）、大豆油（SO）、玉米油（CO）、棕榈油（PO）、卵磷脂油（LO）和猪油（ PL）分别。每种饮食被喂食一式三份的 18 只小龙虾，初始重量为 (13.05 ± 0.60) g，为期 8 周。结果表明，饲喂SO日粮的小龙虾增重率和比生长率明显高于饲喂CO、PO和PL的日粮，而饲喂FO、SO和LO日粮的小龙虾无显着差异。小龙虾饲喂日粮 PL 的饲料转化率最高，成活率最低。与其他组相比，PO组和PL组肌肉脂质含量显着增加。FO组肌肉中EPA、DHA和n-3/n-6比值最高，其次是LO组和SO组。小龙虾饲喂日粮 PL 的血淋巴三酰甘油含量最高，而碱性磷酸酶活性最低。此外，在小龙虾饲喂日粮 FO、SO 和 LO 的血淋巴中观察到总蛋白含量显着增加。总之，在没有任何必需脂肪酸缺乏迹象的情况下，饲喂 FO、SO 和 LO 的小龙虾比饲喂 PL 和 PO 的小龙虾表现出更好的生长。