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RESEARCH ARTICLE (Open Access)

Population demographics of golden perch (Macquaria ambigua) in the Darling River prior to a major fish kill: a guide for rehabilitation

Brenton P. Zampatti https://orcid.org/0000-0001-7394-1387 A B N , Benjamin G. Fanson https://orcid.org/0000-0003-4246-4631 C , Lee J. Baumgartner https://orcid.org/0000-0002-1237-5163 D , Gavin L. Butler https://orcid.org/0000-0003-4933-5306 E , Steven G. Brooks F , David A. Crook https://orcid.org/0000-0003-4035-050X G , Katherine Doyle https://orcid.org/0000-0002-9817-8696 D , Alison J. King https://orcid.org/0000-0002-0104-2611 G , Wayne M. Koster https://orcid.org/0000-0002-9428-3739 C , Roland Maas https://orcid.org/0000-0003-0567-5640 H , Aleksey Sadekov M , Peter Scott https://orcid.org/0000-0002-1352-5901 I , Arron Strawbridge B , Jason D. Thiem https://orcid.org/0000-0002-5585-8560 D J , Zeb Tonkin https://orcid.org/0000-0001-9299-6404 C , Phillipa J. Wilson https://orcid.org/0000-0002-6293-9879 B K , Jon Woodhead https://orcid.org/0000-0002-7614-0136 H and Ryan Woods L
+ Author Affiliations
- Author Affiliations

A CSIRO Land and Water, Locked Bag 2, Glen Osmond, SA 5064, Australia.

B Inland Waters and Catchment Ecology Program, South Australian Research and Development Institute (SARDI) – Aquatic Sciences, PO Box 120, Henley Beach, SA 5022, Australia.

C Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, Heidelberg, Melbourne, Vic. 3084, Australia.

D Institute for Land, Water and Society, Charles Sturt University, PO Box 789, Albury, NSW 2640, Australia.

E Department of Primary Industries, Grafton Fisheries Centre, Grafton, NSW 2460, Australia.

F Electrofishing Services, Wamuran, Qld 4512, Australia.

G Centre for Freshwater Ecosystems, La Trobe University, Wodonga, Vic. 3689, Australia.

H School of Geography, Earth and Atmospheric Sciences, The University of Melbourne, Vic. 3010, Australia.

I Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA 6009, Australia.

J Department of Primary Industries, Narrandera Fisheries Centre, Narrandera, NSW 2700, Australia.

K Australian Institute of Marine Science, Indian Ocean Marine Research Centre, The University of Western Australia (M096), Perth, WA 6009, Australia.

L Department of Environment and Science, Ecosciences Precinct, GPO Box 5078, Brisbane, Qld 4001, Australia.

M Ocean Graduate School, The University of Western Australia, Perth, WA 6009, Australia.

N Corresponding author. Email: brenton.zampatti@csiro.au

Marine and Freshwater Research 73(2) 223-236 https://doi.org/10.1071/MF21033
Submitted: 31 January 2021  Accepted: 16 July 2021   Published: 2 September 2021

Journal Compilation © CSIRO 2022 Open Access CC BY-NC-ND

Abstract

An understanding of population demographics and life history processes is integral to the rehabilitation of fish populations. In Australia’s highly modified Murray–Darling Basin, native fish are imperilled and fish deaths in the Darling River in 2018–19 highlighted their vulnerability. Golden perch (Macquaria ambigua) is a long-lived percichthyid that was conspicuous in the fish kills. To guide population rehabilitation in the Darling River, pre-fish kill age structure, provenance and movement of golden perch were explored using otolith microstructure and chemistry (87Sr/86Sr). Across the Lower and Mid-Darling River, recruitment was episodic, with dominant cohorts associated with years characterised by elevated discharge. There was substantial variability in age structure, recruitment source and movement patterns between the Lower and Mid-Darling River. In the Mid-Darling River, tributaries were an important recruitment source, whereas in the Lower Darling fish predominantly originated in the Darling River itself. Downstream movement of juveniles, upstream migration of adults and return movements to natal locations were important drivers of population structure. Restoring resilient golden perch populations in the Darling River will be reliant on mitigating barriers to movement, promoting a connected mosaic of recruitment sources and reinstating the hydrological and hydraulic factors associated with spawning, recruitment and dispersal. Globally, increasing water resource development and climate change will necessitate such integrated approaches to the management of long-lived migratory riverine fishes.

Keywords: dryland river, migration, Murray–Darling Basin, otolith chemistry, river regulation, strontium isotopes.


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