The taxonomic identity and distribution of the eel cod Muraenolepis (Gadiformes: Muraenolepididae) around South Georgia and the South Sandwich Islands

Fitzcharles, Elaine; Hollyman, Philip R.; Goodall‐Copestake, William P.; Maclaine, James S.; Collins, Martin A.

doi:10.1007/s00300-021-02819-2

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…However, the matched reference contained only a 499 bp sequence, which was 153 bp shorter than ours. The authenticity of BLAST annotation for this species was further confirmed after dedicated morphological re-examination of the fish sample based on key morphological characters ( Figure S1 ) [ 35 ].…”

Section: Resultsmentioning

confidence: 97%

“…Krill trawl net was hauled at a speed of 2 knots for 30 min at a depth of 250 m. All fish samples were roughly categorised and tentatively identified to the finest taxonomic level possible by checking the morphological diagnoses described in Fishes of the Southern Ocean [21] and matching the latest checklist of notothenioid fish species [34] and non-notothenioid fish species [17]. Other pieces of literature were also referred to when resolving the taxonomic identity of a Muraenolepididae member [35]. Muscle tissue samples for molecular analysis were stored in 95% ethanol (Sinopharm Chemical Reagent Co., Ltd., Shanghai, China) following the Barcode of Life protocol for fishes [36].…”

Section: Specimen Collection and Morphological Identificationmentioning

confidence: 99%

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Biodiversity of Demersal Fish Communities in the Cosmonaut Sea Revealed by DNA Barcoding Analyses

Li,

Miao,

Wang

et al. 2024

Genes

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The Cosmonaut Sea is one of the least accessed regions in the Southern Ocean, and our knowledge about the fish biodiversity in the region is sparse. In this study, we provided a description of demersal fish diversity in the Cosmonaut Sea by analysing cytochrome oxidase I (COI) barcodes of 98 fish samples that were hauled by trawling during the 37th and 38th Chinese National Antarctic Research Expedition (CHINARE) cruises. Twenty-four species representing 19 genera and 11 families, namely, Artedidraconidae, Bathydraconidae, Bathylagidae, Channichthyidae, Liparidae, Macrouridae, Muraenolepididae, Myctophidae, Nototheniidae, Paralepididae and Zoarcidae, were discriminated and identified, which were largely identical to local fish occurrence records and the general pattern of demersal fish communities at high Antarctic shelf areas. The validity of a barcoding gap failed to be detected and confirmed across all species due to the indicative signals of two potential cryptic species. Nevertheless, DNA barcoding still demonstrated to be a very efficient and sound method for the discrimination and classification of Antarctic fishes. In the future, various sampling strategies that cover all geographic sections and depth strata of the Cosmonaut Sea are encouraged to enhance our understanding of local fish communities, within which DNA barcoding can play an important role in either molecular taxonomy or the establishment of a dedicated local reference database for eDNA metabarcoding analyses.

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Section: Resultsmentioning

confidence: 97%

Section: Specimen Collection and Morphological Identificationmentioning

confidence: 99%

Biodiversity of Demersal Fish Communities in the Cosmonaut Sea Revealed by DNA Barcoding Analyses

Li,

Miao,

Wang

et al. 2024

Genes

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“…Muraenolepididae, the family of eel cods, comprises one genus, Muraenolepis Günther, 1880, and has five different species: M. marmorata Günther, 1880; M. microps (Lönnberg et al, 1905); M. orangiensis Vaillant, 1888; M. microcephala Norman, 1937; and M. andriashevi Balushkin and Prirodina, 2005. A research identified the mitochondrial 16S and COI sequences of Muraenolepis fishes, confirming that M. microps is a junior synonym of M. marmorata (Fitzcharles et al, 2021). Taxonomically, morphological traits are quite significant.…”

Section: Introductionmentioning

confidence: 91%

“…Among the other Muraenolepis species, M. marmorata is certainly numerous on the South Georgia shelf, but its ecological importance is unclear. Despite the lack of knowledge on the Muraenolepis genus, it may be identified as a key fish in the food chain of numerous Antarctic species living in severe environments (Fitzcharles et al, 2021). Muraenolepis species are also known to live in the Ross Sea Marine Protected Area (MPA).…”

Section: Introductionmentioning

confidence: 99%

Chromosome-level genome assembly of Patagonian moray cod (Muraenolepis orangiensis) and immune deficiency of major histocompatibility complex (MHC) class II

Kim,

Lee,

et al. 2023

Front. Mar. Sci.

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The Patagonian moray cod, Muraenolepis orangiensis, belongs to the family Muraenolepididae and is the sole order of Gadiformes that inhabits the temperate and cold waters of the southern hemisphere. One of the features of the Gadiformes order is that they have a remarkably unique immune gene repertoire that influences innate and adaptive immunity, and they lack major histocompatibility complex (MHC) class II, invariant chains (CD74), and CD4 genes. In this study, a high-quality chromosome-level genome assembly was constructed, resulting in a final assembled genome of 893.75 Mb, with an N50 scaffold length of 30.07 Mb and the longest scaffold being 39.77 Mb. Twenty-five high-quality pseudochromosomes were assembled, and the complete BUSCO rate was 93.4%. A total of 34,553 genes were structurally annotated, and 27,691 genes were functionally annotated. Among the 10 primary genes involved in MHC class II, only two ERAP1 genes and one AIRE gene were identified through the genome study. Although no specific reason for the MHC class II deficiency has been identified, it has been shown that the toll-like receptors (TLRs), which are significant to the innate immune response, are significantly expanded in M. orangiensis. A total of 44 TLRs have been identified, with 32 TLR13 genes distributed evenly on six different pseudochromosomes. This study is the first to reveal the whole genome of a Muraenolepididae family and provides valuable insights into the potential rationale for the MHC class II deficiency in a Gadiformes fish species.

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“…To overcome the limitations of the morphology-based taxonomic classification of Muraenolepis fishes, a study has analyzed the mitochondrial 16S and COI sequences of these fish species, and thereby confirmed that Muraenolepis microps is a junior synonym of M. marmorata [13]. Morphological characteristics are taxonomically very important.…”

Section: Introductionmentioning

confidence: 99%

Genomic Survey and Microsatellite Marker Investigation of Patagonian Moray Cod (Muraenolepis orangiensis)

Choi

Lee

et al. 2022

Animals

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The Muraenolepididae family of fishes, known as eel cods, inhabits continental slopes and shelves in the Southern Hemisphere. This family belongs to the Gadiformes order, which constitutes one of the most important commercial fish resources worldwide, but the classification of the fish species in this order is ambiguous because it is only based on the morphological and habitat characteristics of the fishes. Here, the genome of Patagonian moray cod was sequenced using the Illumina HiSeq platform, and screened for microsatellite motifs. The genome was predicted to be 748.97 Mb, with a heterozygosity rate of 0.768%, via K-mer analysis (K = 25). The genome assembly showed that the total size of scaffolds was 711.92 Mb and the N50 scaffold length was 1522 bp. Additionally, 4,447,517 microsatellite motifs were identified from the genome survey assembly, and the most abundant motif type was found to be AC/GT. In summary, these data may facilitate the identification of molecular markers in Patagonian moray cod, which would be a good basis for further whole-genome sequencing with long read sequencing technology and chromosome conformation capture technology, as well as population genetics.

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The taxonomic identity and distribution of the eel cod Muraenolepis (Gadiformes: Muraenolepididae) around South Georgia and the South Sandwich Islands

Cited by 6 publications

References 26 publications

Biodiversity of Demersal Fish Communities in the Cosmonaut Sea Revealed by DNA Barcoding Analyses

Biodiversity of Demersal Fish Communities in the Cosmonaut Sea Revealed by DNA Barcoding Analyses

Chromosome-level genome assembly of Patagonian moray cod (Muraenolepis orangiensis) and immune deficiency of major histocompatibility complex (MHC) class II

Genomic Survey and Microsatellite Marker Investigation of Patagonian Moray Cod (Muraenolepis orangiensis)

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