Environmental flow releases trigger spawning migrations by Australian grayling Prototroctes maraena, a threatened, diadromous fish

Amtstaetter, Frank; O’Connor, J. P.; Pickworth, Andrew

doi:10.1002/aqc.2570

Cited by 24 publications

(23 citation statements)

References 33 publications

(39 reference statements)

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“…Changes in river discharge and temperature are known triggers of broadscale movement for many riverine fish species (Amtstaetter, O'Connor, & Pickworth, 2016;Harding et al, 2017;Reinfelds, Walsh, Meulen, Growns, & Gray, 2013;Reynolds, 1983). This effect may have been stronger in the Mehi River owing to its intermittent nature.…”

Section: Discussionmentioning

confidence: 99%

Reservoir to river: Quantifying fine‐scale fish movements after translocation

Carpenter-Bundhoo

Butler

Espinoza³

et al. 2019

Ecology of Freshwater Fish

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Translocation of individuals is a widely used tool in the conservation of threatened species. The movement behaviours of translocated individuals in their new environment are a key factor that can influence translocation success (i.e. survival and reproduction). In this study, eel-tailed catfish (Tandanus tandanus) and Murray cod (Maccullochella peelii) movements were monitored using fine-scale acoustic telemetry over a 5-month period in two lowland rivers in eastern Australia. Fine-scale movement and habitat selection were compared among translocated lacustrine and resident riverine T. tandanus and between species. We found no difference in finescale movement behaviours between translocated and resident T. tandanus; however, there was some variation in movement response to environmental variation between species. In contrast, habitat selection varied not only between the two species, but also between resident and translocated T. tandanus individuals. Notably, activity was significantly lower in the first day after release compared to the remainder of the study period. Although T. tandanus translocated from a reservoir had never experienced the environmental fluctuations of a riverine system, individuals still responded in the same way as resident riverine fish, suggesting an innate behavioural response. However, this was not the case for habitat selection, where translocated individuals preferred habitats more common in their source population's lacustrine environment. The findings of this study are important in guiding future conservation efforts involving the translocation of wild-caught fish, primarily the importance of the suitable habitat at the release site to ensure the success and persistence of translocated populations.

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Section: Discussionmentioning

confidence: 99%

Reservoir to river: Quantifying fine‐scale fish movements after translocation

Carpenter-Bundhoo

Butler

Espinoza³

et al. 2019

Ecology of Freshwater Fish

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“…Such characteristics are the first to be removed for flood protection reasons. Restoration of environmental flows, related to the natural flow regime (Poff et al, ) as a key driver not only to trigger fish spawning and connection with floodplains, has become well‐accepted in stream ecology (for reviews see Hughes and Rood, ; Poff and Zimmerman, ), with many recent examples targeting this factor in restoration (Stammel et al, ; Palmer et al, ; Amtstaetter et al, ).…”

Section: Restoration Targets and Optionsmentioning

confidence: 99%

Habitat recovery and restoration in aquatic ecosystems: current progress and future challenges

Geist

Hawkins

2016

Aquatic Conservation

252

188

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ABSTRACT1. Aquatic ecosystems are degraded by a variety of pressures as a result of the growing human population. Global-scale impacts include homogenization of biological communities, removal of top predators and ecosystem engineers, chemical pollution by excess nutrients and contaminants as well as deteriorating structural diversity, connectivity and process dynamics. There is a pressing societal need to reverse the decline in biodiversity and replace lost ecosystem functioning and services in aquatic ecosystems by enabling natural recovery or by active restoration.2. Common concepts and approaches for conservation, recovery and restoration in freshwater and marine ecosystems, aided by recent advances in ecological theory, include decision criteria on priorities for conservation, harnessing natural recovery by cessation of impacts, restoring connectivity and meso-habitat diversity as well as the geomorphological structural template including hydrodynamic processes. Re-oligotrophication at catchment or regional sea-scale benefits from integrating freshwater and marine restoration. Species or assemblages that convey biogenic structure or act as ecosystem engineers and keystone species should be given priority. Top-down control can be reinstated in closed systems.3. Differences between freshwater and marine ecosystems include the greater spatial restriction of many species in fresh water, the importance of rooted vegetation and insects in freshwater, and the much greater dispersal and connectivity in marine systems. These differences dictate different approaches, with more scope for active restoration work in fresh water and harnessing natural recovery in marine systems.4. Restoration schemes need clearly defined target states. They should generally take a process-oriented and stepwise adaptive management approach judging success against reference or control sites. Societal and political expectations need to be managed and restoration schemes should not promise too much. Even minor rehabilitation of degraded ecosystems can put back some biodiversity and key services. Sometimes´Ersatz´-ecosystems are better than nothing and the best that can be achieved, especially in urban settings.

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“…This is consistent with the possibility that increases in discharge attract these fish into rivers. A similar knowledge gap exists for Australian grayling Prototroctes maraena Günther, a threatened, diadromous fish species (Amtstaetter, O'Connor & Pickworth, ). Future investigations into the drivers of recruitment into and up rivers, including discharge, are required.…”

Section: Discussionmentioning

confidence: 92%

Remediation of upstream passage for migrating Galaxias (Family: Galaxiidae) through a pipe culvert

Amtstaetter

O’Connor

Borg

et al. 2017

Fisheries Management Eco

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Movement through streams is critical for the maintenance of diadromous fish populations. Numerous fish passage improvement techniques exist, and knowledge of their effectiveness is required to conserve target species. An existing 70‐m pipe culvert was considered a barrier to the passage success of young‐of‐year (YOY) Galaxias spp. as a result of high water velocity (0.9 m/s). Water velocity in the pipe culvert was reduced by installing a concrete weir downstream of the culvert. A lateral ridge rock‐ramp fishway was installed to provide for the passage of fish over the weir, and baffles were installed in the upstream portion of the culvert to provide refuge from higher water velocity at this location. A BACI design was used to determine whether passage success, measured using a mark–recapture technique, improved as a result of the remediation works. The probability of successful passage of YOY Galaxias spp. through the culvert increased from 0.03 to 0.41 following remediation works and was similar to levels observed at a control site (0.33). The success of the fishway and baffles at this culvert provides an important case study for managers to adopt this technique to improve fish passage on a broader scale and range of other sites.

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Environmental flow releases trigger spawning migrations by Australian grayling Prototroctes maraena, a threatened, diadromous fish

Cited by 24 publications

References 33 publications

Reservoir to river: Quantifying fine‐scale fish movements after translocation

Reservoir to river: Quantifying fine‐scale fish movements after translocation

Habitat recovery and restoration in aquatic ecosystems: current progress and future challenges

Remediation of upstream passage for migrating Galaxias (Family: Galaxiidae) through a pipe culvert

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