Effect of dam removal on habitat use by spawning Atlantic salmon

Dammed river: Short‐ and long‐term consequences for fish species inhabiting a river in a Mediterranean climate in central Chile

“…In the same sense, bottleneck events were detected for both species in the three separate sites of the control basin that do not contain a reservoir. Owing to the damaging effects of dams, restoration programmes including dam removal have begun in different countries, which is very important for the restoration of the normal course of rivers, allowing the restoration of habitat connectivity (Bednarek, 2001;Hill, Trueman, Prévost, Arden, & Grant, 2019), free movement of fish (Kanehl & Lyons, 1997), and for improving their conservation status, (Eding, Crooijmans, Groenen, & Meuwissen, 2002); the results of this study predict important reductions in the genetic diversity of both species that would affect their persistence and conservation in the long term. Therefore, the construction of fish passes or the active translocation of individuals upstream and downstream could address the increasing differentiation of populations and the reduction of genetic diversity on both sides of the Corrales Dam.…”

“…Owing to the damaging effects of dams, restoration programmes including dam removal have begun in different countries, which is very important for the restoration of the normal course of rivers, allowing the restoration of habitat connectivity (Bednarek, 2001; Hill, Trueman, Prévost, Arden, & Grant, 2019), free movement of fish (Kanehl & Lyons, 1997), and for improving their conservation status, regardless of whether they are residents or migrants. The construction of dams continues in areas with Mediterranean climates, however, mainly to retain water in dry periods in order to ensure water supply for the agricultural industry.…”

Spawning migration of Labeobarbus species of Lake Tana across the Gilgel Abay River Weir, Ethiopia: The challenges to fish spawning migration and proposed management solutions

“…Through consultations with government fisheries officials, fishers and local citizens (Table 2), a management plan has been developed to save these highly endangered species of Lake Tana (Table 4). The plan includes the following: Establishment of a fish hatchery and the release of Labeobarbus fingerlings into Lake Tana as suggested by Mequanent et al (2021); Consideration of the key points discussed in the Fisheries Development and Use Proclamation (ANRS, 2007; FDRE, 2003) and Ethiopian Environmental Policy (FDRE, 2002), which should be revised and implemented by integrating fisheries with irrigation water needs; Consideration of fisheries resources in accordance with irrigation, as suggested by Mequanent et al (2022) and Gebremedhin et al (2017) and Lake Tana fisheries stakeholders, noting that addressing stakeholder knowledge gaps about how to use fishery resources is also very important; Noting dam and weir removal are very important, a practice that has already begun in several countries, thereby allowing for the restoration of habitat connectivity (Bednarek, 2001; Hill et al, 2019), free fish movement (Kanehl et al, 1997) and improved conservation status for both residents and migrants; Consideration of alleviating other factors affecting Lake Tana and fishes spawning migration, such as habitat destruction, degradation of the river system, destructive fishing practice and weed infestation. …”

“…1. Establishment of a fish hatchery and the release of Labeobarbus fingerlings into Lake Tana as suggested by (Bednarek, 2001;Hill et al, 2019), free fish movement (Kanehl et al, 1997) and improved conservation status for both residents and migrants;…”

Remote sensing of river habitat for salmon restoration

“…Understanding which rivers have areas of suitable substrate diversity is vital for the recovery of the species. The most common method of data gathering for habitat analysis are in-situ surveys, these involve visual observations of detailed cross-river transects, river segments or specific known spawning habitat (Heggenes et al, 1996;Borsányi et al, 2004;Linnansaari et al, 2009;Hill et al, 2019;Marsh et al, 2020). The data is subsequently used to model and predict habitat use and potential spawning habitat.…”