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Spatial patterns in the demography of a large estuarine teleost: King threadfin, Polydactylus macrochir

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Moore, B. R., Welch, D. J. and Simpfendorfer, C. A. (2011) Spatial patterns in the demography of a large estuarine teleost: King threadfin, Polydactylus macrochir. Marine and Freshwater Research, 62 (8). pp. 937-951.


Article Link: http://doi.org/10.1071/MF11034

Publisher URL: http://www.publish.csiro.au/mf/pdf/MF11034


Understanding spatial patterns in demographic parameters of exploited fish species is of critical importance to effective fisheries management. In the present study, patterns in demography of a large, protandrous, estuarine teleost, king threadfin, Polydactylus macrochir, were compared among three estuaries on the eastern coast of Queensland, Australia. Significant variation in age and growth was observed between fish from the Fitzroy River and those from the Mary and Brisbane Rivers, with Fitzroy River fish living longer (22 years v. 10 and 14 years, respectively), reaching a greater asymptotic length (1222-mm fork length (FL) v. 975- and 1047-mm FL, respectively), and attaining greater length-at-ages of 6 years and beyond. No difference in growth was detected between Mary and Brisbane River fish, or in total mortality among any of the sites. Fitzroy River fish were generally found to mature and change sex at greater lengths and ages than those from the Mary and Brisbane Rivers. The observed variability suggests that spatially segregated populations of P. macrochir may respond differently to fishing pressure and highlights the importance of understanding the spatial patterns in demography of exploited estuarine fish populations. © CSIRO 2011.

Item Type:Article
Business groups:Animal Science
Additional Information:Reproduced with permission from © CSIRO Publishing. Access to published version is available via Publisher’s website.
Keywords:Australia fisheries management growth maturity population biology sex change demographic trend estuarine ecosystem exploitation fishery management growth rate maturation mortality overfishing perciform population ecology sex reversal spatial analysis spatial variation Brisbane River Fitzroy River Mary River Queensland Polydactylus Polynemidae Teleostei
Subjects:Aquaculture and Fisheries > Fisheries > Fishery management. Fishery policy
Live Archive:28 Mar 2019 22:44
Last Modified:03 Sep 2021 16:45

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