1127728_Wright,D_2020.pdf (622.31 kB)
Download fileSize, growth and mortality of riverine golden perch (Macquaria ambigua) across a latitudinal gradient
journal contribution
posted on 2021-03-03, 02:07 authored by Daniel W Wright, Brenton P Zampatti, Lee J Baumgartner, Steven Brooks, Gavin L Butler, David CrookDavid Crook, Ben G Fanson, Wayne Koster, Jarod Lyon, Arron Strawbridge, Zeb Tonkin, Jason D Thiem© 2020 Journal Compilation Effective fisheries management requires fish size, growth and mortality information representative of the population and location of interest. Golden perch Macquaria ambigua is long lived, potamodromous and widespread in the Murray-Darling Basin (MDB), Australia. Using a sample spanning 13 river systems and 10° of latitude, we examined whether the maximum size of golden perch differed by latitude and whether growth and mortality varied between northern and southern MDB regions. The length, weight and age ranges of golden perch sampled (n = 873) were 52-559 mm, 2-3201 g and 0+ to 26+ years respectively, and maximum length and weight were unaffected by latitude. Length and age-length distributions represented by age-length keys varied by region, with greater variability in age-at-length and a larger proportion of smaller individuals in northern MDB rivers, which generally exhibit greater variability in discharge. Growth and mortality rates were similar between regions, and an MDB-wide von Bertalanffy growth model (L∞ = 447, k = 0.32 and t0 = -0.51) and instantaneous mortality rate (Z = 0.20) best described the data. An MDB-wide length-weight equation also provided the best fit (W = 6.76 × 10-6 L3.12). Our data suggest that the MDB can be treated as one management unit in terms of golden perch maximum size, growth and mortality parameters.
Funding
Funding for this study was provided by the Commonwealth Environmental Water Office, Australian Government, under a Murray-Darling Basin Environmental Water Knowledge and Research project, with additional support provided by the Commonwealth Environmental Water Office under its Long-term Intervention Monitoring Project and the Recreational Fishing Freshwater Trust Expenditure Committee. In addition, some sample collections were funded by the Victorian Environmental Flow Monitoring and Assessment Program (Department of Environment, Land, Water and Planning).
History
Publication Date
2020-11-01Journal
Marine and Freshwater ResearchVolume
71Issue
12Pagination
11p. (p. 1651-1661)Publisher
CSIRO PublishingISSN
0067-1940Rights Statement
The Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.Publisher DOI
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Keywords
Science & TechnologyLife Sciences & BiomedicinePhysical SciencesFisheriesLimnologyMarine & Freshwater BiologyOceanographyage-length keyBergmann's ruleMurray-Darling Basinotolith agingvon Bertalanffy growth functionFRESH-WATER FISHMURRAY-DARLING BASINBERGMANNS RULECLIMATE-CHANGEDRYLAND RIVERAGEVARIABILITYMANAGEMENTMOVEMENTSFLOWMarine Biology & Hydrobiology