Fish passage |
Right: The Colville Indian Reservation in Washington State is one of eight Tribal Nations most immediately affected by dams in the Columbia River Basin
Below: California Governor Gavin Newsom has launched the state’s first strategy to restore and protect populations of salmon for generations to come © Sheila Fitzgerald /
Shutterstock.com
In their work they propose an analytical tool that includes a framework of fish migration, life cycle models, an impact coefficient, and a simplified population model. After clarifying migration patterns and life cycles, they show that “the Yangtze dams have severely disrupted the life cycle integrity of these species, causing seven types of invalid stocks and their exponential population declines”. Describing it as a complex issue, Zhenli Huang and Haiying Li say that “China needs to recognise scientific misjudgements to redirect research towards innovation”. They add that it’s also critical for China to learn from four decades of FRPs and focus on reforming its dam-related FRP. The authors also recommend strengthening the oversight of dam owners to clarify their obligations to protect fish. Th add that international cooperation is
urgently needed for China to enhance fish passage and ecological operation technique, helping to address these challenges and share experience in maintaining the balance between fish conservation and dam management.
References
https://www.gov.ca.gov/wp-content/ uploads/2024/01/Salmon-Strategy-for-a-Hotter- Drier-Future.pdf
https://www.doi.gov/media/document/tribal- circumstances-analysis
Dams trigger exponential population declines of migratory fish Zhenli Huang and Haiying L. Huang and Li, Sci. Adv. 10, eadi6580 (2024) 10 May 2024.
www.science.org/doi/10.1126/sciadv.adi6580
Fishheart pilot project in the US exceeded all expectations
Under the supervision of Electric Power Research Institute (EPRI), a test was designed to evaluate the ability of the Fishheart fishway to provide upstream passage for fish especially for migrating American Shad and Herring at an operating hydropower project. The project was hosted by Santee Cooper at the Santee Dam and Spillway site in Pineville, South Carolina. The test had a budget of US$1.3 million
and was funded by the US Department of Energy (DOE). Testing and evaluation were carried out by Fishheart personnel together with Alden Research Laboratory and DOE’s Pacific Northwest National Laboratory (PNNL). The test ran for 21 days. Results exceeded expectations, with
a total number of 4 144 fish, including 16 species from surface to bottom. The following table outlines the species and length ranges of fish that passed safely through the Fishheart fishway.
Species
American Eel American shad
Scientific Name
Anguilla rostrata Alosa sapidissima
Blueback Herring Bluegill Blowfin
Ictalurus furcatus Alosa aestivalis
Number collected
3 291
Black Crapple Pomoxia nigromaculatus 360 Blue Catfish
Lepomis macrochirus Amia calva
1159 673 22 3
Gizzard Shad Dorosoma cepeniadum 1210 Longnose Gar Lepisosteus osseus Redear Sunfush Lepomis microlophus Striped bass Striped mullet
Morone saxatilis Mugil cephalus
Threadfin Shad Dorosoma petenense White Catfish White crapple
Ameiurus catus Pomoxis annularis White perch Morone americana 28 | September 2024 |
www.waterpowermagazine.com
67 67 19 4
238 1 6
21
Min length (mm)
-
315 272 510 215 112 648 285 590 219 415 305 85
262 290 123
Max
Length (mm)
-
488 380
1130 269 225 650 421
1145 365 870 483 157 262 428 320
Average length (mm)
-
398 323 634 244 158 649 345 826 275 582 403 118 -
339 226
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