Effects of dietary nano-selenium on the growth performance, antioxidant capacity, immunity and intestinal microbiota of Tibetan naked carp (Gymnocypris przewalskii)

IF 3.2 2区农林科学 Q1 FISHERIES

Aquaculture Reports Pub Date : 2024-10-28 DOI:10.1016/j.aqrep.2024.102431

Yanxia Chen , Caixia He , Ying Yang , Linan Wang , Zhaonan Li , Qingchun Yan , Tianxiu Liang , Changhong Bao , Wenjie Jin , Changzhong Li

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引用次数: 0

Abstract

This study aimed to investigate the effects of nano-selenium (nano-se) as a dietary supplement on Tibetan naked carp (Gymnocypris przewalskii) and six separate groups were conducted (0 mg/kg, NSEC; 2 mg/kg, NSE2; 4 mg/kg, NSE4; 7 mg/kg, NSE7; 9 mg/kg, NSE9; and 11 mg/kg, NSE11). The growth performance, hemato-biochemical activity, antioxidant activity, immune indices, and intestinal microbiota were subsequently measured at the end of the feeding experiment. The results showed that the hepatosomatic index, viscerosomatic index and condition factor were significantly greater in the NSE4 group (P < 0.05). The NSE4 group presented the highest specific growth rate and weight gain rate, whereas the NSE11 group presented the lowest rates. The survival rate was greater in the NSE2, NSE4, and NSE9 groups, whereas it was lowest in the NSE11 group. The contents of TP and TG and the activities of T-AOC, GSH-Px, T-SOD, CAT and GR first increased but then decreased with increasing dietary selenium content. Compared with the other groups, the NSE4 group presented comparatively lower levels of proinflammatory factors such as IL-1β, IL-6, and TNF-α, but higher amounts of lysozyme LZM and immunoglobulin IgM. The NSE4 and NSE2 groups presented considerably increased levels of anti-inflammatory factors (IL-10 and TGF-β) (P < 0.05). Dietary supplementation with an appropriate amount of nano-se can improve liver vacuolationand hepatocyte swelling in G. przewalskii, but excessive nano-se could cause liver damage. In addition, the results of intestinal microbiota detection revealed that dietary nano-se could improve the diversity of the intestinal microbiota and increase the abundance of beneficial bacteria in G. przewalskii. This research will enhance our understanding of the possible uses of nano-se and lay the groundwork for increasing the resource efficiency of G. przewalskii breeding and releasing.

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膳食纳米硒对西藏裸鲤生长性能、抗氧化能力、免疫力和肠道微生物群的影响

本研究旨在探讨纳米硒（nano-se）作为膳食补充剂对西藏裸鲤（Gymnocypris przewalskii）的影响，共进行了六组实验（0 mg/kg，NSEC；2 mg/kg，NSE2；4 mg/kg，NSE4；7 mg/kg，NSE7；9 mg/kg，NSE9；11 mg/kg，NSE11）。随后，在饲喂实验结束时测量了生长性能、血液生化活性、抗氧化活性、免疫指数和肠道微生物群。结果表明，NSE4 组的肝脏指数、粘液指数和体况因子显著高于 NSE4 组（P < 0.05）。NSE4 组的特定生长率和增重率最高，而 NSE11 组最低。NSE2、NSE4 和 NSE9 组的存活率较高，而 NSE11 组最低。随着膳食硒含量的增加，TP和TG的含量以及T-AOC、GSH-Px、T-SOD、CAT和GR的活性先升高后降低。与其他组相比，NSE4 组的促炎因子（如 IL-1β、IL-6 和 TNF-α）水平相对较低，但溶菌酶 LZM 和免疫球蛋白 IgM 的含量较高。NSE4 和 NSE2 组的抗炎因子（IL-10 和 TGF-β）水平显著增加（P < 0.05）。膳食中补充适量的纳米硒可改善 G. przewalskii 的肝脏空泡化和肝细胞肿胀，但过量的纳米硒会造成肝损伤。此外，肠道微生物群检测结果表明，膳食纳米se可改善przewalskii肠道微生物群的多样性，增加有益菌的数量。这项研究将加深我们对纳米se可能用途的理解，并为提高G. przewalskii繁殖和释放的资源效率奠定基础。

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来源期刊

Aquaculture Reports Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

5.90

自引率

8.10%

发文量

469

审稿时长

77 days

期刊介绍： Aquaculture Reports will publish original research papers and reviews documenting outstanding science with a regional context and focus, answering the need for high quality information on novel species, systems and regions in emerging areas of aquaculture research and development, such as integrated multi-trophic aquaculture, urban aquaculture, ornamental, unfed aquaculture, offshore aquaculture and others. Papers having industry research as priority and encompassing product development research or current industry practice are encouraged.