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


Moore, BR and Welch, DJ and Simpfendorfer, CA, Spatial patterns in the demography of a large estuarine teleost: king threadfin, Polydactylus macrochir, Marine and Freshwater Research, 62, (8) pp. 937-951. ISSN 1323-1650 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 CSIRO

DOI: doi:10.1071/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.

Item Details

Item Type:Refereed Article
Keywords:king threadfin, Australia, fisheries management, growth, maturity, population biology, sex change
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Moore, BR (Dr Bradley Moore)
ID Code:121425
Year Published:2011
Web of Science® Times Cited:9
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2017-09-28
Last Modified:2017-11-02

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