Effect of Dietary Copper on Growth Performance, Antioxidant Capacity, and Immunity in Juvenile Largemouth Bass (Micropterus salmoides)

文献类型： 外文期刊

第一作者： Kayiira, John Cosmas

作者： Kayiira, John Cosmas;Liang, Hualiang;Ren, Mingchun;Huang, Dongyu;Kayiira, John Cosmas;Liang, Hualiang;Ren, Mingchun;Mi, Haifeng;Zhang, Lu;Teng, Tao

作者机构：

关键词： largemouth bass; copper requirement; plasma biochemistry; Nrf2 signaling pathway; NF-kappa b signaling pathway

期刊名称：FISHES （ 影响因子：2.4； 五年影响因子：2.4 ）

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年卷期： 2024 年 9 卷 9 期

页码：

收录情况： SCI

摘要： This study evaluated the optimal dietary copper (Cu) levels and their effects on growth performance, body composition, and antioxidant capacity in juvenile largemouth bass (Micropterus salmoides). A total of 360 fish (initial average weight (1.67 +/- 0.01 g) and initial average length (2.5 +/- 0.2 cm)) were randomly assigned to 18 tanks, each containing 20 fish and six dietary Cu concentrations: 2.13 (control), 3.00, 3.66, 4.58, 4.64, and 5.72 mg/kg. The results indicated that fish receiving 3.00 mg/kg of Cu exhibited the best final body weight (FBW), weight gain rate (WGR), and specific growth rate (SGR), with a significantly reduced feed conversion ratio (FCR). While body composition (moisture, protein, lipid, and ash) remained consistent across groups, plasma total protein (TP) levels increased with Cu supplementation. Elevated triglycerides (TG) and albumin (ALB) were noted at 4.64 and 5.72 mg/kg, respectively, while glucose (GLU) levels decreased with an increase in dietary Cu. Antioxidant capacity, assessed via hepatic glutathione (GSH) and the activities of catalase (CAT), and showed significant improvements at 3.00 and 3.66 mg/kg Cu, while superoxide dismutase (SOD) showed the highest activity at a dietary Cu level of 5.72 mg/kg. Additionally, the expressions of tgf-beta and tnf-alpha genes were significantly upregulated at a dietary Cu level of 5.72 mg/kg, while il-8 and il-10 genes were upregulated at dietary 3.66 mg/kg. The expression of nrf2 was significantly upregulated in response to a dietary Cu level of 3.66 mg/kg compared to the control group, and the expression of the keap1 gene was significantly upregulated in the fish fed with 5.72 mg/kg of dietary Cu. The results indicated that appropriate dietary supplementation could promote the growth performance and improve the antioxidant status the immunity of largemouth bass, and the optimal Cu requirement for FCR and SGR were approximately 3.10 mg/kg and 3.00 mg/kg, respectively.

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