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Improving Fish Habitats and Populations
Restoration efforts (reconnecting meanders, diversifying flow patterns, recreating gravel beds, hiding spots, spawning grounds, etc.) make it possible to:
Diversifying habitats: fast- and slow-flowing areas, pools, riverbeds, natural banks, deadwood, etc., which are beneficial to various species and at different life stages (reproduction, growth, shelter).
Restoring ecological continuity: Removal or bypassing of obstacles (sills, dams) to allow fish (trout, grayling, cyprinids, etc.) to migrate freely, thereby promoting recruitment and the colonization of new river sections.fao+2
Improving water and sediment quality: better filtration, oxygenation, and reduced silt buildup, which benefits eggs, juveniles, and sensitive species.
In the medium and long term, these improvements result in more abundant and diverse fish populations, sometimes leading to the return of species that had disappeared locally.
Measured Effects on Catch Rates
Recent studies, particularly in Switzerland, show a direct positive impact on recreational fishing:
- In the restored sections, as well as upstream and downstream, capture rates are significantly higher than in areas not subject to restoration.
- The effect is particularly pronounced after the restoration of longitudinal connectivity (unrestricted fish movement), with an increase in catches averaging about 8 percent, and up to 15.8 percent in certain sections upstream of the construction site.
- Improvements in the sediment transport regime (the natural transport of sediments) are also associated with an increase of about 5% in the capture rate.
These benefits increase over time, as habitats stabilize and populations recover.
In other words, restoration isn't just an ecological "bonus"?it also improves recreational fishing in terms of the number of fish caught.
Benefits for the fishing experience and the appeal of the sites
Beyond purely fisheries-related considerations, river restoration also improves fishing conditions for anglers:
- A more natural and pleasant landscape: vegetated riverbanks, meandering waterways, and a variety of settings?all of which make fishing more enjoyable and sometimes attract more anglers.
- Improved accessibility and safety in certain well-designed projects: access paths, parking areas, and unobtrusive features integrated into the landscape.
- A positive image of fishing: an activity associated with high-quality environments, biodiversity, and ecological restoration, which can strengthen its social acceptance and political support.
