Introduction

There are 27 species of sturgeons, all with ray-finned bodies but not neopterygian bodies. They are in the family Acipenseridae, which is in the class Actinopterygii, subclass Chondrostei, and order Acipenseriformes (Fricke et al. 2023), and has paraphyletic intergenic clades (Luo et al. 2019; Nedoluzhko et al. 2020; Shen et al. 2020). Their natural populations of 25 extant species in the wild (Froese and Pauly 2023; IUCN 2023) are distributed in riverine, lacustrine, estuarine, and coastal waters of the Northern Hemisphere (Pikitch et al. 2005), with non-native populations in South America (Avigliano et al. 2023). They are a remarkable evolutionary relic, earning the designation of “living fossils” by Charles Darwin (1859, p. 107). Positioned at the phylogenetic base of ray-finned fishes, sturgeons, with their archaic forms and ganoid scales, appear “frozen in time” (Du et al. 2020). Teleosts of neopterygian ray-finned fish went through three to four rounds of whole-genome duplications (Pasquier et al. 2016), but sturgeons only went through two rounds, kee** their primitive traits (Cheng et al. 2019; Du et al. 2020; Zhang et al. 2021).

Despite their unique biological characteristics, sturgeons present challenges for genome analyses due to diverse chromosome aneuploidy (Havelka et al. 2011). Studies have found that the number of chromosomes in different sturgeon species varies a lot. They range from 112 for the shovelnose sturgeon (Scaphirhynchus platorynchus) (Ohno et al. 1969) to 372 ± 6 for the shortnose sturgeon (Acipenser brevirostrum) (Fontana et al. 2008), 437 for the cultured Siberian sturgeon (A. baerii) (Havelka et al. 2016), and even 520 for the artificial octoploid Russian sturgeon (A. gueldenstaedtii) (Lebeda et al. 2020). These findings make it harder to do genomic engineering. Whole-genome sequencing has been done with only two sturgeon species (A. ruthenus and A. sinensis) (Cheng et al. 2019; Du et al. 2020; Wang et al. 2023a, b) and one paddlefish (Polyodon spathula) of the sturgeon-related family Polyodontidae (the order Acipenseriformes) (Zhang et al. 2021), besides complete mitochondrial genomes of Atlantic, Gulf, and European sturgeons (A. oxyrinchus oxyrinchus, A. o. desotoi, and A. sturio) (Liu et al.

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Funding

Open Access funding provided by Hiroshima University. Part of this study was supported by JSPS KAKENHI No. 21K05782.

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Qi Liu: collection and analysis of relevant publications, and writing—original draft preparation. Takeshi Naganuma: conceptualization and planning of the review article, and writing—review and editing, supervision.

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Correspondence to Takeshi Naganuma.

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Liu, Q., Naganuma, T. Metabolomics in sturgeon research: a mini-review. Fish Physiol Biochem (2024). https://doi.org/10.1007/s10695-024-01377-8

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