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Dietary soybean lecithin promoted growth performance and feeding in juvenile Chinese perch (Siniperca chuatsi) could be by optimizing glucolipid metabolism

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Abstract

To explore the potential benefits of dietary phospholipids (PLs) in fish glucose metabolism and to promote feed culture of Chinese perch (Siniperca chuatsi), we set up six diets to feed Chinese perch (initial mean body weight 37.01 ± 0.20 g) for 86 days, including: Control diet (CT), 1% (SL1), 2% (SL2), 3% (SL3), 4% (SL4) soybean lecithin (SL) and 2% (KO2) krill oil (KO) supplemental diets (in triplicate, 20 fish each). Our study found that the SL2 significantly improved the weight gain rate and special growth rate, but the KO2 did not. In addition, the SL2 diet significantly improved feed intake, which is consistent with the mRNA levels of appetite-related genes (npy, agrp, leptin A). Additionally, in the CT and SL-added groups, leptin A expression levels were nearly synchronized with serum glucose levels. Besides, the SL2 significantly upregulated expression levels of glut2, gk, cs, fas and downregulated g6pase in the liver, suggesting that it may enhance glucose uptake, aerobic oxidation, and conversion to fatty acids. The SL2 also maintained the hepatic crude lipid content unchanged compared to the CT, possibly by significantly down-regulating the mRNA level of hepatic lipase gene (hl), and by elevating serum low-density lipoprotein (LDL) level and intraperitoneal fat ratio in significance. Moreover, the serum high-density lipoprotein levels were significantly increased by PL supplementation, and the SL2 further significantly increased serum total cholesterol and LDL levels, suggesting that dietary PLs promote lipid absorption and transport. Furthermore, dietary SL at 1% level could enhance non-specific immune capacity, with serum total protein level being markedly higher than that in the CT group. In conclusion, it is speculated that the promotion of glucose utilization and appetite by 2% dietary SL could be linked. We suggest a 1.91% supplementation of SL in the diet for the best growth performance in juvenile Chinese perch.

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All data are available from the corresponding author by request.

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Funding

This work was financially supported by The Key Research & Development Program of Hubei Province (2022BBA0051).

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Dongliang Wu drafted the manuscript. Dongliang Wu, Di Peng, and Xu-Fang Liang designed the experiments. Dongliang Wu, Di Peng, Ruipeng Xie, Ming Zeng, Junliang Chen, Jie Lan, Ru Yang, Jiacheng Hu, and Peisong Lu performed the experiments. All authors read and approved the final manuscript.

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Correspondence to Xu-Fang Liang.

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All experiments and animal-handling procedures were approved by the Ethics Committee of the Institute of Laboratory Animal Centre, Huazhong Agricultural University (Ethical code: HZAUFI-2020-0004).

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The authors declare no competing interests.

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Wu, D., Peng, D., Liang, XF. et al. Dietary soybean lecithin promoted growth performance and feeding in juvenile Chinese perch (Siniperca chuatsi) could be by optimizing glucolipid metabolism. Fish Physiol Biochem 49, 1097–1114 (2023). https://doi.org/10.1007/s10695-023-01241-1

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