Abstract
Anguillids evolved between 20 and 40 million years ago and, as catadromous fish, migrate between marine and freshwater environments. The migration occurs only twice in the lifetime of most eels: when they migrate as larvae to coastal and river habitats, and again as adult, when they return to their natal habitat to spawn. In temperate species, the migrations are extreme, requiring larvae and adults to swim thousands of km before reaching their destination, but the migrations of tropical species (hundreds of km) are still remarkable in comparison with many other fish species. To achieve these migratory feats, eel larvae and adults are uniquely adapted to oceanic environments. We describe and discuss these adaptations, and identify the challenges and opportunities ahead for aquaculture and eel conservation.
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Notes
- 1.
Note that, for ease of comparison, all measurements of swimming speed have been converted to km d−1, regardless of the original units of measurement. In most cases, tracking of eels was only possible for a few hours, so most swimming speeds are extrapolations.
- 2.
In swimming trials, swimming speed is generally measured in terms of body lengths per second. This is because the optimal swimming speed for a fish of a certain size is always in relation to its body length, not its actual length. This is a fundamental biomechanical feature of swimming behaviour of all fishes. However, swimming speed may then be converted to a distance covered per second to enable analysis of swimming capability.
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Righton, D., Aarestrup, K., Jellyman, D., Sébert, P., van den Thillart, G., Tsukamoto, K. (2013). Extreme Swimming: The Oceanic Migrations of Anguillids. In: Palstra, A., Planas, J. (eds) Swimming Physiology of Fish. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31049-2_2
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