Virus infections of the European Eel in North Rhine Westphalian rivers

Danne, Linna; Horn, Lisa; Feldhaus, Anita; Fey, Daniel; Emde, Sebastian; Schütze, Heike; Adamek, Mikołaj; Hellmann, John

doi:10.1111/jfd.13536

Cited by 8 publications

(8 citation statements)

References 50 publications

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“…These duplication events, genetic raw materials were provided to facilitate new adaptations to the changing environment 65 . The duplicated gene functions of eels are immune-related to respond against different pathogens, which has been linked to the major factor contributing to the decline of eel populations 4,19,53 . Presumably, physiological fitness for adaptation might have been weakened by changes in the ecological environment, causing these evolutionary novelties 5 .…”

Section: Discussionmentioning

confidence: 99%

A Chromosome-level Assembly of the Japanese Eel Genome, Insights into Gene Duplication and Chromosomal Reorganization

WANG

Wan

et al. 2022

Preprint

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Japanese eels (Anguilla japonica) are commercially important species that have been harvested extensively for foods. Currently, this and related species (American and European eels) are difficult to breed on a commercial basis. Wild stock is used for aquaculture. Due to pollution, overfishing, and international trafficking, eel populations are declining. The International Union for Conservation of Nature lists Japanese eels as critically endangered and on its red list. Here we presented a high-quality genome assembly for Japanese eels and demonstrated that large chromosome reorganizations occurred in the events of third-round whole-genome duplications (3R-WRD). Following multiple chromosomal fusion and fission rearrangement, the Anguilla lineage has reduced the haploid chromosomal number of 19 from the ancestral proto-chromosomal number of 25. Phylogenetic analysis of expanded gene families showed the gene families of olfactory receptors and voltage-gated Ca2+-channel expanded significantly. The expansion of olfactory receptors (group delta and zeta genes) and voltage-gated Ca2+-channel gene families are important for olfaction and neurophysiological functions. Following 3R-WGD, additional tandem (TD) and proximal (PD) duplications occurred to acquire immune-related genes for adaptation. The Japanese eel assembly presented here can be used to study other Anguilla species that are related to evolution and conservation.

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Section: Discussionmentioning

confidence: 99%

A Chromosome-level Assembly of the Japanese Eel Genome, Insights into Gene Duplication and Chromosomal Reorganization

WANG

Wan

et al. 2022

Preprint

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“…Eel viruses have been detected in both wild and farmed eels (van Beurden et al, 2012;Danne et al, 2022;Haenen et al, 2010).…”

Section: Virusesmentioning

confidence: 99%

“…Eel viruses have been detected in both wild and farmed eels (van Beurden et al., 2012; Danne et al., 2022; Haenen et al., 2010). Viruses are particularly problematic because of their ability to remain dormant, to spread through seemingly healthy populations and become virulent under certain conditions (Haenen et al., 2009).…”

Section: Eel Pathogens Damages and Symptomsmentioning

confidence: 99%

Anguilla sp. diseases diagnoses and treatments: The ideal methods at the crossroads of conservation and aquaculture purposes

Parchemin

Tapissier‐Bontemps

Sasal

et al. 2022

Journal of Fish Diseases

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Anguilla anguilla, A. japonica and A. rostrata are the most fished and consumed eel species. However, these species are Critically Endangered, Endangered and Endangered, respectively. A combination of factors is thought to be responsible for their decline including fisheries, climate change, habitat destruction, barriers to migration, pollution and pathogens. Among them, viruses, bacteria and parasites are causing weakening of wild eels and serious economic losses for fishermen and eel farmers. Early detection of pathogens is essential to provide appropriate responses both for conservation reasons and to limit economic losses. Classic diagnosis approaches are time consuming and invasive and usual treatments, for example, antipathogenic substances are becoming obsolete because of pathogen resistance and environmental impact problems. The need for early and non‐invasive diagnostic methods as well as effective and environmentally friendly treatments has increased. Vaccine development and diet supplementation have known a growing interest since their use could allow prevention of diseases. In this review, we summarize the main pathogens—viruses, bacteria and parasites—of the three northern temperate eel species, the methods used to detect these pathogens and the different treatments used. We discussed and highlighted the need for non‐invasive, rapid and efficient detection methods, as well as effective and environmentally friendly treatments for both conservation and aquaculture purposes.

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“…Primers and probes sequences are listed in Table 2. The target for detection of EPV-1 is a fragment of the 2C gene, primers were described recently (Danne et al, 2021). EPV-1 probe was deduced from the published EPV-1 sequence NC_022332.1 (Fichtner et al, 2013).…”

Section: Real-time Pcrmentioning

confidence: 99%

“…In 2013 a study demonstrated the infection of a diseased yellow eel with a novel picornavirus (EPV-1) in Lake Constance (Fichtner et al, 2013). Currently, EPV-1 was isolated from elvers and yellow eels caught in the Rhine system in Germany (Danne et al, 2021). Knowledge about some virus infections of eels is still at the beginning and to date, some findings of eel viruses come from other eel species.…”

mentioning

confidence: 99%

Identification of virus infections of European eels intended for stocking measures

Danne

Adamek²,

Wonnemann³

et al. 2022

Journal of Fish Diseases

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The spread of viral diseases in eels is suggested to severely affect the European eel (Anguilla anguilla) panmictic population. The European Commission has initiated the Eel Recovery Plan (Council Regulation No. 1100/2007) to try to return the European eel stock to more sustainable levels within that measures eel restocking. However, scientific evidence evaluating the efficacy of stocking remains scarce. In addition, knowledge about the impact and contribution of eel stocking on the distribution of infectious diseases is insufficient. In this study, we aimed to investigate virus infections in batches of eels intended for restocking. We analysed samples of glass eels from certified fisheries and farmed European eels from different aquaculture farms. All analysed eels were purchased within a North Rhine Westphalian conservation program. Via a combination of cell culture and qPCR‐based techniques, we detected infections of glass eels with the rhabdovirus Eel Virus European X and anguillid herpesvirus 1 infections in farmed eels (10–15 cm).

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Virus infections of the European Eel in North Rhine Westphalian rivers

Abstract: The panmictic population of the European eel Anguilla anguilla is declining dramatically throughout its distribution range since the

Cited by 8 publications

References 50 publications

A Chromosome-level Assembly of the Japanese Eel Genome, Insights into Gene Duplication and Chromosomal Reorganization

A Chromosome-level Assembly of the Japanese Eel Genome, Insights into Gene Duplication and Chromosomal Reorganization

Anguilla sp. diseases diagnoses and treatments: The ideal methods at the crossroads of conservation and aquaculture purposes

Identification of virus infections of European eels intended for stocking measures

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