Anguillid eels have fascinated humans for centuries, but our knowledge of these mysterious fish is still scant. There are 19 species or subspecies in the genus Anguilla, which are found globally, except in the eastern Pacific and southern Atlantic. Their common label 'freshwater eels' is a misnomer - all anguillids are facultatively catadromous, born in marine environments, developing in continental waters, with a proportion never entering freshwater at all. Anguillid eels have several life history traits that have allowed them to exploit a broad range of habitats. As such, anguillid eels play an important ecological role in both marine and freshwater environments as well as being commercially valuable. Because of this, anguillid eels are under threat from multiple stressors, such as barriers to migration, pollution, parasites, disease, climate change and unsustainable exploitation. Six species are listed as Threatened in the Red List of Threatened Species, and four are listed as Data Deficient. Strengthening conservation and management of these species is essential, and further research provides an exciting opportunity to develop a greater understanding of this mysterious clade of fish.
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Reconstructing the experienced temperature during the larval oceanic migration of anguillid eels from otolith stable oxygen isotopes.
Sci Rep
January 2025
Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8564, Chiba, Japan.
Migration routes and the depth patterns of anguillid eel larvae migrating long distances from spawning grounds in the ocean remain poorly understood. We used otolith stable isotope analysis to study the oceanic migrations of anguillid eels by reconstructing experienced water temperature histories of larvae. The otolith stable oxygen isotopes (δO) of recruited Anguilla japonica glass eels were analyzed to assess the relationship with the experienced water temperature of the early larval stage in laboratory experiments.
View Article and Find Full Text PDFDevelopment Using Bioluminescence Imaging of a Recombinant Anguillid Herpesvirus 1 Vaccine Candidate Associated with Normal Replication In Vitro but Abortive Infection In Vivo.
Vaccines (Basel)
December 2024
Immunology-Vaccinology, Department of Infectious and Parasitic Diseases, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medicine, University of Liège, B-4000 Liège, Belgium.
Background/objectives: Anguillid herpesvirus 1 (AngHV-1) (recently renamed Cyvirus anguillidallo 1) is the etiologic agent of a lethal disease that affects several eel species. It is thought to be one of the main infectious agents causing a population decline in wild eels and economic loss within the eel aquaculture sector. To date, no vaccines are available against AngHV-1.
View Article and Find Full Text PDFDifferences in odor preferences of glass eels of two sympatric anguillid eels, the Japanese eel Anguilla japonica and the Indo-Pacificeel A. marmorata.
J Fish Biol
October 2024
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Japan.
Water-choice experiments were conducted using glass eels of Anguilla japonica and A. marmorata, which coexist in subtropical East Asian rivers. The results of the present study, together with those of previous water-choice experiments, suggest that salinity enhances the odor preferences of glass eels.
View Article and Find Full Text PDFHighly contiguous genome assembly and gene annotation of the short-finned eel (Anguilla bicolor pacifica).
Sci Data
August 2024
Department of Life Science, Chung-Ang University, Seoul, 06974, Korea.
In East Asia, anguillid eels are commercially important. However, unlike other species, they have not been successfully cultivated throughout their lifecycle. Facing population decline due to overharvesting and environmental pressures, the industry is turning to alternatives, such as Anguilla bicolor pacifica (short-finned eel).
View Article and Find Full Text PDFDevelopment of a loop-mediated isothermal amplification (LAMP) assay for rapid and visual detection of Anguillid herpesvirus 1.
J Virol Methods
December 2024
Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China. Electronic address:
Article Synopsis
- * Anguillid herpesvirus 1 (AngHV) has been identified as the cause of these diseases, prompting the development of a new diagnostic tool.
- * A loop-mediated isothermal amplification (LAMP) assay was created to swiftly and accurately detect AngHV, proving to be over 100 times more sensitive than traditional PCR methods, making it a promising solution for early diagnosis in eel farms.
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