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Otolith shape and elemental composition: complementary tools for stock discrimination of mulloway (Argyrosomus japonicus) in southern Australia
Citation
Ferguson, GJ and Ward, TM and Gillanders, BM, Otolith shape and elemental composition: complementary tools for stock discrimination of mulloway (Argyrosomus japonicus) in southern Australia, Fisheries Research, 110, (1) pp. 75-83. ISSN 0165-7836 (2011) [Refereed Article]
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DOI: doi:10.1016/j.fishres.2011.03.014
Abstract
Otolith based methods have the potential to discriminate between stocks, an important requirement for
sustainable management of fish. The abilities of two otolith based methods to investigate stock structure
of the sciaenid Argyrosomus japonicus in South Australia were compared: (i) elemental signatures (Sr:Ca,
Ba:Ca, and Mg:Ca) from the otolith edge, and (ii) shape characteristics (otolith morphometrics and overall
shape) of whole otoliths. Comparison of elemental signatures indicated that Ba:Ca levels were low in
the western coast, intermediate in the central coast and high in the eastern coast. Constrained Canonical
Analysis of Principal Coordinates (CAP) allocated elemental concentrations of individual otoliths
to regions with 100, 100, and 87% success for western, central and eastern coasts respectively. Otolith
shape (elliptical Fourier descriptors and morphological indices) supported results from the elemental
study with allocation success of 85, 57, and 85% for western, central and eastern coasts respectively.
Shape analysis was then used to investigate the origin of individuals caught in marine waters but suspected
of being from an aquaculture facility. The two stock discrimination methods were complementary
because trace-element analysis of the otolith edge provided very high classification success and gave a
snapshot of differences between groups from different geographic areas, while shape analysis indicated
that these discrete groups of fish experienced different environmental conditions over a long period of
time. Results from this study highlight the importance of multiple methods in stock discrimination and
suggest sub-structuring of the stock of A. japonicus in South Australia.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | otolith microchemistry, otolith shape, stock structure, mulloway |
| 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: | Ward, TM (Associate Professor Timothy Ward) |
| ID Code: | 147623 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 59 |
| Deposited By: | Sustainable Marine Research Collaboration |
| Deposited On: | 2021-11-10 |
| Last Modified: | 2021-11-15 |
| Downloads: | 0 |
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