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Age and growth of Pomatomus saltatrix in the south-western Pacific Ocean (eastern Australia), with a global comparison

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Schilling, H. T., Stewart, J., Litherland, L., Smith, J. A., Everett, J. D., Hughes, J. M. and Suthers, I. M. (2023) Age and growth of Pomatomus saltatrix in the south-western Pacific Ocean (eastern Australia), with a global comparison. Marine and Freshwater Research, 74 (6). pp. 463-478.

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Article Link: https://doi.org/10.1071/MF22216

Publisher URL: https://www.publish.csiro.au/paper/MF22216


Context: Pomatomus saltatrix is one of few globally distributed pelagic mesopredators that is exploited heavily throughout its range. Despite the implementation of management strategies, the south-western Pacific Ocean (eastern Australian) population has few published estimates of the key life-history parameters including growth.Aims: To estimate the age and growth of P. saltatrix in the south-western Pacific and compare these with the age and growth in other populations.Methods: Age estimates were made using whole otolith readings and an age–length key was used with a length frequency distribution to estimate the age structure of the population. Eight different growth models were compared within a Bayesian framework for both juvenile and overall growth.Key results: The Schnute growth equation provided the best fit for overall growth and yielded parameter values of a = −0.15, b = 2.56, Size-at-age 1 = 24.38-cm fork length (FL) and Size-at-age 4 = 47.36 cm FL.Conclusions: P. saltatrix in the south-western Pacific has a growth rate similar to that in other populations of P. saltatrix.Implications: Despite its geographically and genetically distinct populations, P. saltatrix demonstrates a generally consistent life-history strategy of fast growth and high mortality, except for the north-western Atlantic population, which has lower mortality.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Keywords:age validation, Australian, Bayesian growth models, bluefish, life history, mortality, recreational fishing, Schnute growth curve, tailor, whole otolith.
Live Archive:29 Aug 2023 01:36
Last Modified:29 Aug 2023 01:36

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