Direct observations of American eels migrating across the continental shelf to the Sargasso Sea

Béguer‐Pon, Mélanie; Castonguay, Martin; Shan, Shiliang; Benchetrit, José; Dodson, Julian J.

doi:10.1038/ncomms9705

Cited by 72 publications

(75 citation statements)

References 35 publications

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“…This is important to be aware of, especially since thiamine deficiency has been observed even in remote areas. For example, thiamine deficiency must be taken into account in the attempts to track animal movements, such as the silver eels’ migration to the Sargasso Sea, by use of telemetry equipment404142. It is also possible that thiamine treatment of silver eels is necessary before viable offspring can be produced by hormonal treatment in the laboratory and in future aquaculture43444546.…”

Section: Discussionmentioning

confidence: 99%

Widespread episodic thiamine deficiency in Northern Hemisphere wildlife

Balk

Hägerroth

Gustavsson

et al. 2016

Sci Rep

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Many wildlife populations are declining at rates higher than can be explained by known threats to biodiversity. Recently, thiamine (vitamin B1) deficiency has emerged as a possible contributing cause. Here, thiamine status was systematically investigated in three animal classes: bivalves, ray-finned fishes, and birds. Thiamine diphosphate is required as a cofactor in at least five life-sustaining enzymes that are required for basic cellular metabolism. Analysis of different phosphorylated forms of thiamine, as well as of activities and amount of holoenzyme and apoenzyme forms of thiamine-dependent enzymes, revealed episodically occurring thiamine deficiency in all three animal classes. These biochemical effects were also linked to secondary effects on growth, condition, liver size, blood chemistry and composition, histopathology, swimming behaviour and endurance, parasite infestation, and reproduction. It is unlikely that the thiamine deficiency is caused by impaired phosphorylation within the cells. Rather, the results point towards insufficient amounts of thiamine in the food. By investigating a large geographic area, by extending the focus from lethal to sublethal thiamine deficiency, and by linking biochemical alterations to secondary effects, we demonstrate that the problem of thiamine deficiency is considerably more widespread and severe than previously reported.

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Section: Discussionmentioning

confidence: 99%

Widespread episodic thiamine deficiency in Northern Hemisphere wildlife

Balk

Hägerroth

Gustavsson

et al. 2016

Sci Rep

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“…They subsequently penetrate continental waters, turning into pigmented yellow eels, where they colonize a large range of continental habitats from brackish to freshwater (Arai & Chino, ; Daverat et al., ). After a growth phase lasting from 3 to over 30 years, yellow eels metamorphose into silver eels and migrate back to their spawning grounds (Béguer‐Pon, Castonguay, Shan, Benchetrit, & Dodson, ; Chang, Miyazawa, & Béguer‐Pon, ; Righton et al., ). The eels mature en route and presumably die following spawning.…”

Section: Introductionmentioning

confidence: 99%

Freshwater eels: A symbol of the effects of global change

Drouineau

Durif

Castonguay³

et al. 2018

Fish and Fisheries

Self Cite

109

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Temperate eels Anguilla anguilla (European eel), A. rostrata (American eel) and A. japonica (Japanese eel) are three catadromous species which have been declining since the 1970s/1980s despite their remarkable adaptive capacity. Because of their specific life cycles, which share distant oceanic spawning grounds and continental growth stage, eels are affected by five components of the global change: (a) climate change affecting larval survival and drift, (b) an increase in pollution leading to high levels of contamination exacerbated by their high lipid levels, (c) increasing fragmentation and habitat loss that reduce dramatically the amount of available habitats and induce increased spawner mortality, (d) the appearance of Anguillicola crassus a parasitic alien nematode that impairs spawning success, and (e) the impact of commercial and recreational fisheries for all life stages of eel. In this context, the rapid increases of pressures during the “Great Acceleration” have surpassed the adaptive capacity of eels. This illustrates that cumulative effects of global change can lead to the collapse of species, even in species that have amazingly high adaptive capacities.

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“…Revolutionary new conceptual, experimental, computational and technological advances have dramatically changed approaches in aquatic ecology, facilitating the development of strategies for dealing with future challenges. For example, modern genetics and genomics methods have revealed the fine‐scale genetic diversity within and among fish populations, advanced modelling tools have allowed incorporating multiple individual‐level processes in simulation models used to address realistic large‐scale management scenarios, and technological developments in survey equipment have enhanced our ability to study and conserve deep‐water ecosystems and species of particular concern (Dunlop et al, ; Favaro et al, ; Beguer‐Pon et al, ; Fernandes et al, ; Valenzuela‐Quiñonez, ). The following examples are not intended to be comprehensive, but provide case studies of how increases in understanding or new technologies have improved the management of fish populations.…”

Section: Learning From Previous Successesmentioning

confidence: 99%

Fishes in a changing world: learning from the past to promote sustainability of fish populations

Gordon

Harding

Clever

et al. 2018

Journal of Fish Biology

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Populations of fishes provide valuable services for billions of people, but face diverse and interacting threats that jeopardize their sustainability. Human population growth and intensifying resource use for food, water, energy and goods are compromising fish populations through a variety of mechanisms, including overfishing, habitat degradation and declines in water quality. The important challenges raised by these issues have been recognized and have led to considerable advances over past decades in managing and mitigating threats to fishes worldwide. In this review, we identify the major threats faced by fish populations alongside recent advances that are helping to address these issues. There are very significant efforts worldwide directed towards ensuring a sustainable future for the world's fishes and fisheries and those who rely on them. Although considerable challenges remain, by drawing attention to successful mitigation of threats to fish and fisheries we hope to provide the encouragement and direction that will allow these challenges to be overcome in the future.

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Direct observations of American eels migrating across the continental shelf to the Sargasso Sea

Cited by 72 publications

References 35 publications

Widespread episodic thiamine deficiency in Northern Hemisphere wildlife

Widespread episodic thiamine deficiency in Northern Hemisphere wildlife

Freshwater eels: A symbol of the effects of global change

Fishes in a changing world: learning from the past to promote sustainability of fish populations

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