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 design of an eel ladder has the eel swim over the barrier using an eel ascending ramp, which provides the eels a climbing substrate to "push against" while slithering upstream. For some higher barriers, elevator-style systems are also used.

An eel ladder typically consists of four parts: an eel ascending ramp, a supporting structure, a water-feeding system, and a side gutter. The eel ascending ramp can be a fairly simple construction, such as a hollowed out tree filled with recycled fishing net, or a more complex structure designed to accommodate specific species or ages of eels. The supporting structure mounts the ladder to the barrier. The rampside gutter provides an attraction flow to draw eels toward the ladder while the water-feeding system ensures the proper flow of water to the gutter.

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Eels

True eels	Anguilliformes Anguilloidei freshwater eels false morays mud eels spaghetti eels moray eels thin eels Protanguillidae Congroideis worm eels congers longneck eels pike congers duckbill eels snake eels Other snipe eels sawtooth eels cutthroat eels

Other eels	Blind cave eel Bobtail snipe eels Cusk eels Electric eel Fire eel Gulper eel Pelican eel Rubber eel Sand eels Slime eel Spiny eel Swamp eels Tire track eel Wolf eel

As food	Eel (food) Anago Eel pie Jellied eels Kabayaki Unadon

Related topics	Eel life history Eel ladder Ely Eel Day Eel pot Glass eels Leptocephalus (larvae) Abaia Eel cuddling Sina and the Eel Sniggle

Fisheries science and wild fisheries

Fisheries science	Population dynamics of fisheries Shifting baseline Fish stock Fish mortality Condition index Stock assessment Fish measurement Standard weight in fish Fish counter Data storage tag Catch per unit effort Otolith microchemical analysis Biomass Fisheries acoustics Acoustic tag Coded wire tag GIS and aquatic science Pop-up satellite archival tag EcoSCOPE Age class structure Trophic level Trophic cascades Match/mismatch hypothesis Fisheries and climate change Marine biology Aquatic ecosystems Bioeconomics EconMult Ecopath FishBase Census of Marine Life OSTM Fisheries databases Institutes Fisheries scientists

Wild fisheries	Ocean fisheries Diversity of fish Coastal fish Coral reef fish Demersal fish Forage fish Pelagic fish Cod fisheries Crab fisheries Eel fisheries Krill fisheries Kelp fisheries Lobster fisheries Shrimp fishery Eel ladder Fish ladder Fish screen Migration Salmon run Sardine run Shoaling and schooling Marine habitats Marine snow Water column Upwelling Humboldt current Algal blooms Dead zones Fish kill

Fisheries management, sustainability and conservation

Management	Fisheries management Fisheries law Monitoring control and surveillance Vessel monitoring system Fishery Resources Monitoring System Catch reporting Fisheries observer Illegal, unreported and unregulated fishing Magnuson–Stevens Act Pulse fishing Fisheries organizations

Quotas	Catch share Individual fishing quota Minimum landing size Slot limit Bycatch Discards Incidental catch Cetacean bycatch Turtle excluder device Shrimp-Turtle case EU quotas EU MLS Exclusive economic zone

Sustainability	Sustainable fisheries Maximum sustainable yield List of harvested aquatic animals by weight Sustainable seafood Overfishing Environmental effects of fishing Fishing down the food web Destructive fishing practices Future of Marine Animal Populations The Sunken Billions The End of the Line

Conservation	Marine Protected Area Marine reserve Marine conservation Marine conservation activism Salmon conservation Grey nurse shark conservation Shark sanctuary

Organisations	The Black Fish Marine Stewardship Council Friend of the Sea SeaChoice Seafood Watch Ocean Conservancy Oceana Sea Around Us Project WorldFish Center Defying Ocean's End HERMIONE PROFISH International Seafood Sustainability Foundation Sea Shepherd Conservation Society Greenpeace

Related issues	CalCOFI Fish slaughter Marine pollution Mercury in fish Shark finning Threatened sharks Threatened rays

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Eel ladder

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