eel ascending ramp
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Eel ladder — An eel ladder is type of fish ladder designed to help eels swim past barriers, such as dams and weirs or even natural barriers, to reach upriver feeding grounds. (Many eels are catadromous, living in fresh water but spawning at sea.) The basic… … Wikipedia
eel ladder — a fish ladder designed to help eels over dams and weirs. A substrate is provided for the eels to push against when slithering upstream. A fish elevator may be part of the process at high dams. See also eel ascending ramp … Dictionary of ichthyology