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Essential oil of Magnolia denudata is an effective anesthetic for spotted seabass (Lateolabrax maculatus): a test of its effect on blood biochemistry, physiology, and gill morphology

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Abstract

Magnolia denudata is a well-known ornamental tree in China due to its beautiful blossoms, and it has been used as an analgesic to treat human headaches. This study investigated the anesthetic potential and physiological response of the essential oil of M. denudata flowers on spotted seabass Lateolabrax maculatus. Fish (mean ± SD, 164.16 ± 15.40 g) were individually exposed to different concentrations of M. denudata essential oil (MDO, 10, 20, 40, 60, 80, 100, and 120 mg/L) and eugenol (10, 20, 30, 40, 50, 60, and 70 mg/L) to investigate anesthetic efficacy. Based on the ideal time criterion for anesthetic induction (< 3 min) and recovery (< 10 min), the lowest effective concentration for spotted seabass was 100 mg/L for MDO and 60 mg/L for eugenol. The physiological and histopathological damage in the gill of L. maculatus after using MDO and eugenol was also evaluated at the minimum dose inducing deep anesthesia, and at 0, 6, and 24 h after recovery. The results showed that MDO and eugenol anesthesia alleviated the levels of cortisol and glucose and the lactic dehydrogenase activity induced by handling. Compared with eugenol, MDO also caused secondary stress to the body, but MDO caused minor physiological responses and histological changes in the gills. This study suggests that MDO is an effective anesthetic for spotted seabass.

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Funding

This research was supported by the fun of Key-Area Research and Development Program of Guangdong Province (2021B0202030001), China—ASEAN Maritime Cooperation Fund Project “China—ASEAN Modern Marine Fishery Technical Cooperation and Industrial Development Demonstration,” the fund of Central Public-interest Scientific Institution Basal Research Fund, South China Sea Fisheries Research Institute, CAFS (2021SD19), the fund of Guangdong Province Modern Agricultural Industrial Technology System Innovation Team Building Project (2022KJ150), the fund of Guangzhou Science and Technology Planning Project (201904010169), the fund of National Key Research and Development Plan Projects (2019YFD0900500), and the fund of Guangdong Province Supporting Town and Villages Technology Commissioner Project (KTP20210259).

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X.Z., H.D. and J.Z. designed the experiment. X.Z. and H.D. performed the experiments, data analyses, and drafted the manuscript.W.J., W.W., Y.D. and J.C. contributed with essential materials. All authors have given approval to the final version of the manuscript, decided to submit the work for publication. The authors like to thank all the laboratory members for experimental material preparation and technical assistance, and thank to Prof. Jian Qin, Flinders University, for providing revisions and suggestions in the manuscript writing.

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Correspondence to Jiasong Zhang.

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The collection and handling of the animals in this study were approved by the Animal Care and Use Committee at the South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences (SCSFRI-CAFS), and all experimental animal protocols were carried out in accordance with national and institutional guidelines for the care and use of laboratory animals at the SCSFRI-CAFS.

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Zeng, X., Dong, H., Wu, J. et al. Essential oil of Magnolia denudata is an effective anesthetic for spotted seabass (Lateolabrax maculatus): a test of its effect on blood biochemistry, physiology, and gill morphology. Fish Physiol Biochem 48, 1349–1363 (2022). https://doi.org/10.1007/s10695-022-01124-x

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  • DOI: https://doi.org/10.1007/s10695-022-01124-x

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