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| Fish Migration Facility | |
|---|---|
| Name | Fish Migration Facility |
Fish Migration Facility
Fish migration facilities provide engineered passages, bypasses, and assisted-transport systems at barriers to support diadromous and potamodromous species such as salmonids, sturgeons, shads, and eels. They are implemented at dams, weirs, culverts, and tide gates to mitigate fragmentation affecting populations managed under fisheries regimes, conservation programs, and water-resource projects. Facilities integrate hydrology, civil engineering, fisheries biology, and conservation policy to restore connectivity for species governed by treaties, management plans, and transboundary agreements.
Fish migration facilities aim to re-establish longitudinal and lateral connectivity for species like Atlantic salmon, Chinook salmon, Pacific salmon, European eel, American shad, and White sturgeon affected by infrastructure such as Hoover Dam, Three Gorges Dam, Aswan High Dam, and regional impoundments. Their purposes include complying with mandates from institutions such as the U.S. Fish and Wildlife Service, Environment Agency (England), Fisheries and Oceans Canada, and directives like the European Union Habitats Directive. Projects often intersect with programs by the World Wildlife Fund, The Nature Conservancy, International Union for Conservation of Nature, and national agencies responsible for water resources and hydropower such as Tennessee Valley Authority and Bureau of Reclamation. Outcomes sought include restoring runs protected under listings like the Endangered Species Act or guided by agreements like the Columbia River Basin Compact.
Design categories include nature-like bypass channels, technical fish ladders, fish lifts, fish locks, fish screens, and fish-friendly turbines. Examples of design paradigms appear in structures near Grand Coulee Dam, Bonneville Dam, Itaipu Dam, and smaller installations at regional weirs on rivers such as the Thames, Seine, Rhine, Danube, and Mekong River. Engineering typologies reference works by designers associated with institutions such as US Army Corps of Engineers, Hydro-Quebec, Federal Energy Regulatory Commission, and consultancies used by projects for World Bank financed hydropower. Specific device types include pool-and-weir ladders, vertical-slot ladders, Denil fishways, nature-like bypasses, and eel passes applied in settings like Loch Leven, Lake Ontario, and San Joaquin River restoration projects.
Operational regimes align with water-release scheduling from operators such as National Grid, California Department of Water Resources, Scottish Environment Protection Agency, and dam owners like Xcel Energy. Management includes adaptive protocols used by organizations such as NOAA Fisheries, Fisheries and Oceans Canada, IUCN, and regional fishery councils including the Pacific Fishery Management Council. Maintenance and oversight incorporate practices from the International Hydropower Association guidelines and national permitting authorities like the Environmental Protection Agency (United States) and Natural Resources Wales. Operational strategies coordinate with hatchery programs run by entities like Washington Department of Fish and Wildlife and Alaska Department of Fish and Game to balance wild and cultured stock interactions.
Facilities affect population dynamics of taxa such as Sockeye salmon, Coho salmon, Rainbow trout, Brown trout, European smelt, Alewife, River lamprey, and Shortnose sturgeon. Impacts include changes in migration timing, genetic structure monitored under frameworks like the Convention on Biological Diversity, predator–prey interactions observed near passages (e.g., by Osprey, Bald eagle, Pike), and disease transmission considered by health authorities such as World Organisation for Animal Health. Projects are evaluated in light of restoration initiatives like the Columbia Basin Fish Restoration Program, River Restoration Centre efforts, and habitat directives steered by agencies like Natural England.
Civil and hydraulic engineering factors incorporate sediment transport studies, structural designs from standards used by American Society of Civil Engineers, electrofishing and fish handling ergonomics informed by protocols from International Fish Passage Conference proceedings, and materials supplied under procurement guided by institutions like European Investment Bank for large projects. Site selection considers geomorphology, flood control plans coordinated with Federal Emergency Management Agency, and seismic design per codes referenced by organizations like International Code Council. Construction often requires permits from authorities such as Corps of Engineers (United States Army), Environment Agency (England), and compliance with environmental impact assessment procedures exemplified by National Environmental Policy Act reviews.
Effectiveness is assessed using telemetry (PIT tags, radio telemetry), sonar imaging, and genetic methods applied in studies by universities such as University of Washington, University of British Columbia, University of Copenhagen, ETH Zurich, and research institutes like NOAA Northwest Fisheries Science Center and Fisheries and Oceans Canada laboratories. Monitoring programs employ statistical frameworks from agencies like U.S. Geological Survey and modeling tools developed at centers such as Pacific Northwest National Laboratory and CNR (Italy). Long-term studies reference datasets curated by institutions including FishBase and international workshops like the World Fish Migration Foundations symposiums and World Conference on Dam Removal.
Policy frameworks involve regulators and stakeholders including riverine communities, Indigenous groups such as the Confederated Tribes of the Colville Reservation, Haida Nation, and government bodies like Department for Environment, Food and Rural Affairs and Ministry of Environment (Ontario). Regulatory oversight comes from entities such as Federal Energy Regulatory Commission relicensing processes, national courts adjudicating environmental disputes, and multilateral financing conditions imposed by institutions like the World Bank and Asian Development Bank. Stakeholder engagement often includes NGOs like Trout Unlimited, Conservation International, and community science facilitated by organizations such as Riverkeepers.
Category:Fish conservation