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Influence of latitudinal variation in environmental gradients and population structure on the demography of a widespread pelagic fish, Arripis trutta (Forster, 1801)

Citation

Hughes, JM and Stewart, J and Lyle, JM and McAllister, J and Stocks, JR and Suthers, IM, Influence of latitudinal variation in environmental gradients and population structure on the demography of a widespread pelagic fish, Arripis trutta (Forster, 1801), Environmental Biology of Fishes, 100, (2) pp. 121-135. ISSN 0378-1909 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Springer Science+Business Media Dordrecht

DOI: doi:10.1007/s10641-016-0565-y

Abstract

Knowledge of the influence of both spatial and temporal environmental gradients on life history traits and population demographics is a critical requirement in the management of exploited fish populations. This study examined variation in the demographics of Arripis trutta, an economically-important pelagic fish species with a broad latitudinal distribution in the waters of coastal south-eastern (SE) Australia, a region dominated by the influence of the East Australian Current (EAC). A validated ageing protocol was first developed using sectioned sagittal otoliths, which in turn permitted examination of latitudinal variation in A. trutta growth, size compositions and age compositions. The von Bertalanffy growth function parameters for A. trutta in SE Australia were estimated to be L = 63.20 ± 0.37 cm fork length (FL), k = 0.26 ± 0.01 yr−1 and to = −0.14 ± 0.03 yr, with a maximum estimated age of 12.7 years. Growth was shown to be faster with decreasing latitude likely due to a simple relationship with the latitudinal gradient in water temperature; fastest growth occurring in northern NSW and slowest growth occurring in Tasmania. Latitudinal patterns in growth were remarkably similar to those previously reported for this species, despite age being estimated using scale readings some 40 years ago. This consistency in latitudinal growth patterns of a temperate fish can be attributed to the life history-related movements undertaken by A. trutta in this region. This temporally-consistent movement pattern is supported by the spatial gradient in the size and age composition of A. trutta sampled from different latitudes in both the current and historical research, whereby numbers of large and old fish increase progressively from Tasmania to northern NSW. These results highlight the need to consider the potential for spatial size- or age-structuring in the development of sampling designs and interpretation of results for any study examining spatial or temporal variation in demographic parameters of exploited fish populations.

Item Details

Item Type:Refereed Article
Keywords:Arripidae, age structure, size composition, East Australian Current, growth, age validation
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Sciences not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Fin Fish (excl. Tuna)
Author:Lyle, JM (Dr Jeremy Lyle)
Author:McAllister, J (Mr Jaime McAllister)
ID Code:113081
Year Published:2016
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2016-12-11
Last Modified:2017-03-30
Downloads:0

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