Abstract
Zinc is an essential micronutrient for organisms involved in regulating various biological processes. This study evaluated the effects of dietary zinc on growth performance, digestive enzyme activities, antioxidant status, and immune responses of sea cucumber Apostichopus japonicus. Five experimental diets were formulated with graded levels of zinc (0, 20, 40, 60, and 80 mg/kg, respectively), and the actual dietary zinc values were 31.4, 51.0, 68.2, 91.9, and 110.8 mg/kg diet, respectively. Sea cucumbers were fed with diets for 2 months. The results showed the growth performance, amylase, and trypsin activities of sea cucumber increased significantly with zinc supplementation, and the best growth performance and enzyme activities were observed at 40 mg/kg zinc diet. Zinc supplementation significantly increased activities of superoxide dismutase, catalase, anti-superoxide anion, and inhibiting hydroxyl radical, while significantly reduced the malondialdehyde content. Furthermore, the higher zinc supplementation levels resulted in significantly upregulated immune-related genes of hsp90, p105, rel, and lsz, suggesting that excessive zinc caused oxidative stress. The broken-line regression analysis of specific growth rate indicated dietary zinc requirement in juvenile sea cucumber was ~ 66.3 mg/kg diet. Overall, dietary zinc contributes to the growth and immune resistance of juvenile sea cucumber, and our study will provide insights into the rational use of dietary zinc in aquaculture.
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Data and materials supporting the results are available upon reasonable request from the corresponding author.
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The authors would like to express their sincere thanks to the staff of laboratory for their help and logistic support during the experiment.
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This work was supported by the grants from the National Natural Science Foundation of China (Project Nos. 31672657).
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Yuling Xu, Qinfeng Gao, and Shulin Dong conceived and designed the experiments; Yaoping Mei, Xueqi Li, Kang Dong, and Zhao Li participated in the collection and determination of the experimental samples; Yuling Xu wrote the article; Qinfeng Gao and Zhishuai Hou revised the manuscript.
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All animal experiments were conducted in accordance with the guidelines and approval of the respective Animal Research and Ethics Committees of Ocean University of China (Permit Number: SCXY-B20230203). The field studies did not involve endangered or protected species.
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Xu, Y., Gao, Q., Dong, S. et al. Effects of Dietary Zinc on Growth Performance, Digestive Enzyme Activities, Antioxidant Status, and Immune Responses of Sea Cucumber Apostichopus japonicus. Biol Trace Elem Res 202, 1767–1775 (2024). https://doi.org/10.1007/s12011-023-03766-1
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DOI: https://doi.org/10.1007/s12011-023-03766-1