Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Age-related movement patterns and population structuring in southern garfish, Hyporhamphus melanochir, inferred from otolith chemistry
Author: Steer, M.
Fowler, A.
Gillanders, B.
Citation: Fisheries Management and Ecology, 2009; 16(4):265-278
Publisher: Blackwell Science Ltd
Issue Date: 2009
ISSN: 0969-997X
Statement of
M. A. Steer & A. J. Fowler and B. M. Gillanders
Abstract: <jats:p><jats:bold>Abstract </jats:bold> The southern garfish, <jats:italic>Hyporhamphus melanochir</jats:italic> (Val.), is an important inshore fishery species in South Australia. Over the past few years there have been concerns with this fishery, which is now considered to be over‐exploited. Currently, the fishery is assumed to consist of two separate stocks, but there is no understanding of movement patterns both within and between these two stocks to justify this assumption. Otolith chemistry was used to infer age‐related patterns of movement, delineate potential sub‐populations and determine the extent of mixing within South Australian coastal waters. Results indicated that the population structuring of garfish is more complex than previously assumed and it seems that stocks can be discriminated at a much finer spatial scale. Garfish collected from sites separated by &lt;60 km displayed significantly different chemical signatures (relative concentrations of <jats:sup>7</jats:sup>Li, <jats:sup>24</jats:sup>Mg, <jats:sup>55</jats:sup>Mn, <jats:sup>88</jats:sup>Sr and <jats:sup>138</jats:sup>Ba) in their otoliths, especially during their second year of growth, indicating that they had inhabited different water bodies. From a broader perspective, South Australian garfish can be partitioned into six regional components with various levels of inter‐mixing. From these results, it was suggested that assessment and management of the fishery may have to be restructured to align with the smaller spatial units.</jats:p>
Keywords: discrimination
trace elements
Description: © 2009 Blackwell Publishing Ltd
DOI: 10.1111/j.1365-2400.2009.00660.x
Published version:
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute Leaders publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.