Environmental flows stimulate the upstream movement of juvenile diadromous fishes
F. Amtstaetter
A B , Z. Tonkin A , J. O’Connor A , I. Stuart A and W. M. Koster A
+ Author Affiliations
- Author Affiliations
A Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, Vic. 3084, Australia.
B Corresponding author. Email: frank.amtstaetter@delwp.vic.gov.au
Marine and Freshwater Research 72(7) 1019-1026 https://doi.org/10.1071/MF20222
Submitted: 16 July 2020 Accepted: 24 November 2020 Published: 27 January 2021
Abstract
River regulation has degraded aquatic biodiversity globally, and the effects can be pronounced for diadromous species, whose life history processes can depend on flow conditions, such as cues for adult migration, spawning, attracting recruits into coastal rivers and promoting upstream dispersal. Environmental flows are being used to mitigate the effects of river regulation, and understanding their effectiveness is required to improve management practices. This study examined the effects of targeted environmental flows on the upstream dispersal of three temperate catadromous fish species, namely common galaxias Galaxias maculatus, tupong Pseudaphritis urvillii and short-finned eel Anguilla australis. Fyke netting was used to capture fish moving upstream before and during environmental flows in summer and autumn in two coastal rivers. We found significant increases in the catch of young-of-the-year (YOY) common galaxias (6-fold higher) and juvenile short-finned eel (26-fold higher), relative to control sites, during environmental flow pulses compared with stable, regulated base-flow conditions. A significant response was not detected for YOY tupong, despite a 39% increase in the catch. These results demonstrate that environmental flows enhance the upstream movement of juvenile diadromous fishes, a critical process governing population persistence or recovery. The findings provide managers with confidence in the use of environmental flows to support populations.
Keywords: diadromy, dispersal, freshet releases, Galaxiidae, river regulation.
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