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Type: Journal article
Title: Stock discrimination of Southern Garfish (Hyporhamphus melanochir) by stable isotope ratio analysis of otolith aragonite
Author: Steer, M.
Halverson, G.
Fowler, A.
Gillanders, B.
Citation: Environmental Biology of Fishes, 2010; 89(3-4):369-381
Publisher: Kluwer Academic Publ
Issue Date: 2010
ISSN: 0378-1909
Statement of
Mike A. Steer, Galen P. Halverson, Anthony J. Fowler and Bronwyn M. Gillanders
Abstract: Stable isotope analysis (δ18O and δ13C) of otolith aragonite was used to infer ontogenetic patterns of movement, delineate sub-population structure, and determine the mixing of Southern Garfish (Hyporhamphus melanochir) in South Australian waters. Adult garfish from the 2+ age class were collected from three sites within each of six regions along the South Australian coast: Northern Gulf St. Vincent, South West Gulf St. Vincent, Kangaroo Island, Northern Spencer Gulf, South West Spencer Gulf and the West Coast of Eyre Peninsula. Significant spatial variation was detected in mean δ18O and δ13C values among sites within regions and as a function of fish age. Salinity, rather than sea surface temperature, appeared to account for regional variation in δ18O, whereas variation in diet and metabolic processes were suggested to account for observed differences in δ13C. Otolith oxygen and carbon stable isotope values indicated that the South Australian Southern Garfish fishery is comprised of multiple, regional, population components that persist through time. Both the West Coast and Northern Spencer Gulf regions constitute distinct population components that exhibit little inter-regional mixing and therefore may be considered as discrete management units. The South West Spencer Gulf region may also be considered a separate population component, however, its level of connectivity with Gulf St. Vincent is uncertain. With the exception of juvenile garfish from Kangaroo Island, there was no clear regional separation within Gulf St. Vincent.
Keywords: Population structure; Stable isotopes; Hemiramphidae; Otolith; South Australia
Rights: © Springer Science+Business Media B.V. 2010
RMID: 0020098155
DOI: 10.1007/s10641-010-9670-5
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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