Lake Eyre golden perch (Macquaria sp.) spawning and recruitment is enhanced by flow events in the hydrologically variable rivers of Lake Eyre Basin, Australia
B. J. Cockayne A D , D. Sternberg A , D. W. Schmarr B , A. W. Duguid C and R. Mathwin B
+ Author Affiliations
- Author Affiliations
A Department of Natural Resources and Mines, 22–30 Wood Street, Mackay, Qld 4740, Australia.
B South Australia Research and Development Institute, PO Box 120 Henley Beach, SA 5022, Australia.
C Northern Territory Department of Land Resource Management, PO Box 1120, Alice Springs, NT 0871, Australia.
D Corresponding author. Email: bernie.cockayne@dnrm.qld.gov.au
Marine and Freshwater Research 66(9) 822-830 https://doi.org/10.1071/MF14242
Submitted: 14 August 2014 Accepted: 30 October 2014 Published: 19 March 2015
Abstract
Understanding the links between fish recruitment and riverine flows is integral for setting priorities for river-management strategies, particularly in hydrologically variable and unpredictable arid and semi-arid zone rivers. In the present study, we used daily and annual otolith age estimates to identify relationships between riverine flow and spawning and recruitment of Lake Eyre golden perch (Macquaria sp.); an endemic fish of the Lake Eyre Basin, central Australia. We found a close association between Lake Eyre golden perch spawning and periods of increased river flow, with most of spawning occurring 0–35 days after the start of these flow events. Spawning occurred throughout the year but was commonly observed during the first flow events proceeding consecutive months of no-flow when water temperatures exceeded 26°C. Spawning was not dependent on floodplain inundation, with most spawning occurring during within-channel flow events. Annual average year-class strength was related to the number of flow events per year, but not total annual discharge, or the number of low-flow days per year. These results highlight the importance of natural within-channel flow patterns to Lake Eyre golden perch spawning and recruitment and demonstrate the importance of maintaining the natural flow regime of Australia’s arid- and semi-arid-zone rivers.
Additional keywords: endemic, event spawning, flow regime, low flow, otolith ageing, water-resource development, year-class strength, young-of-year.
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