Age and growth of Pomatomus saltatrix in the south-western Pacific Ocean (eastern Australia), with a global comparison
MARINE AND FRESHWATER RESEARCH(2023)
摘要
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.
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关键词
age validation,Australian,Bayesian growth models,bluefish,life history,mortality,recreational fishing,Schnute growth curve,tailor,whole otolith
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