FRESHWATER FISHERIES ECOLOGY. Edited by J. F. Craig. 920 pp. Published by Wiley‐Blackwell, Oxford, U.K., 2015. Price £79.50. ISBN: 978‐1‐118‐39442‐7.

Freshwater Fisheries Ecology

Barrier removal is a recognized solution for reversing river fragmentation, but restoring connectivity can have consequences for both desirable and undesirable species, resulting in a connectivity conundrum. Selectively passing desirable taxa while restricting the dispersal of undesirable taxa (selective connectivity) would solve many aspects of the connectivity conundrum. Selective connectivity is a technical challenge of sorting an assortment of things. Multiattribute sorting systems exist in other fields, although none have yet been devised for freely moving organisms within a river. We describe an approach to selective fish passage that integrates ecology and biology with engineering designs modeled after material recycling processes that mirror the stages of fish passage: approach, entry, passage, and fate. A key feature of this concept is the integration of multiple sorting processes each targeting a specific attribute. Leveraging concepts from other sectors to improve river ecosystem function may yield fast, reliable solutions to the connectivity conundrum.

/pdf/single-stream-recycling-inspires-selective-fish-passage-1qp822ju5t.pdf

Single-Stream Recycling Inspires Selective Fish Passage Solutions for the Connectivity Conundrum in Aquatic Ecosystems.

Effective fishways are required for restoring fish migrations and reversing worldwide declines in freshwater fish while making sustainable use of water resources. Mitigation of barrier effects at h...

Laboratory testing of an innovative tube fishway concept

Movements and Migration

The migration of fish is influenced by the unique environmental characteristics of the destination and migratory habitat preferences. There are three fishways in Miyanaka Intake Dam. The rock-ramp fishway was newly established in 2012, creating an environment with different flow velocities and water depths. The purpose of this study was to investigate the effectiveness of the new rock-ramp fishway for native fish through two surveys. In the first survey, traps were installed during the survey period in all three fishways and all fish were caught. The run-up environment was quantified by measuring the flow velocity. In the second survey, fish were caught by spectrum methods upstream and downstream from the dam. It was found that bottom-dwelling fish and swimming fish not bound to the bottom with low migration abilities used the rock-ramp fishway for migration and as a habitat. After the new rock-ramp fishway was built, catches increased upstream from the dam. Further, the rock-ramp fishway is a potential habitat for certain species, such as Cottus pollux. As this is the first study to demonstrate the effectiveness of rock-ramp fishways, the research results are expected to be valuable to fishery managers and those planning river engineering projects.

https://www.mdpi.com/2073-4441/14/13/1991/pdf?version=1655958469

Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways

Australia’s first trap-and-haul fishway was built to overcome site-related and biological challenges of providing upstream fish transfer at a 62 m dam. Challenges included multiple barriers, major ...

A trap-and-haul fishway for upstream transfers of migrating fish at a challenging dam site

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A trap-and-haul fishway for upstream transfers of migrating fish at a challenging dam site