期刊
MICROORGANISMS
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/microorganisms10112208
关键词
European eel (Anguilla Anguilla); illegal trade; EVEX virus; phylogenetic analyses; critically endangered species
类别
This study evaluates the health and diseases of the European eel, as well as the origin of glass eels. The findings suggest that the decline of European eels may be attributed to illegal trading, overfishing, and diseases.
The European eel (Anguilla anguilla) is a catadromous species that inhabits the rivers of the Adriatic watershed in Croatia. It is a critically endangered fish species, according to the IUCN, due to its declining abundance in European rivers caused by overfishing and trafficking and by diseases caused by nematodes, pathogenic bacteria and viruses. An illegal parcel of glass eels was confiscated at the Zagreb Airport and was intended to re-populate Croatian rivers. Barcoding was employed to determine species affiliation, and a thorough health check was carried out. This study reports the evaluation of gross lesions, histological findings, and EVEX virus isolation and identification. Since the confiscated glass eels were of unknown origin and given the serological and genetic similarities of EVA and EVEX, we designed primers and probes for almost whole genome sequencing to elucidate the origin of glass eels based on viral phylogeny. Bayesian phylogeny showed that the isolated strain had the most common ancestor with a Danish isolate and likely evolved from the French isolate of EVEX. These findings are discussed in light of the divergence of recently isolated strains and their possible contribution to the decrease of the abundance of the European eel in European waters.
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