Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Gut content- and stable isotope-derived diets of four commercially and recreationally important fish species in two intermittently open estuaries

Wade L. Hadwen A B , Grant L. Russell A and Angela H. Arthington A
+ Author Affiliations
- Author Affiliations

A Cooperative Research Centre for Sustainable Tourism, and Australian Rivers Institute, The Griffith School of Environment, Griffith University Nathan Campus, Brisbane, Qld 4111, Australia.

B Corresponding author. Email: w.hadwen@griffith.edu.au

Marine and Freshwater Research 58(4) 363-375 https://doi.org/10.1071/MF06157
Submitted: 4 September 2006  Accepted: 12 February 2007   Published: 13 April 2007

Abstract

Despite remaining closed for variable periods, intermittently open estuaries provide habitat for estuarine and marine fish species of commercial and recreational value. To better understand how these systems trophically support their fish assemblages, the diets of four valued fish species, namely Acanthopagrus australis, Platycephalus fuscus, Sillago ciliata and Mugil cephalus, were examined in two intermittently open estuaries in New South Wales, Australia. Fish diets were determined using both gut contents and stable isotope analyses because the different temporal resolutions afforded by these methods can provide insight into the flexibility of fish diets. Stable isotope signatures of prey and fish proved to be particularly useful in analyses of the diets of M. cephalus and P. fuscus, because these species consume large quantities of unidentifiable organic matter and have high incidences of empty guts respectively. Diet reconstructions across methods were generally consistent for A. australis, but differed substantially for S. ciliata, with fewer prey taxa identified in the guts than expected. This result suggests that individual S. ciliata switch between local resources on the basis of their fluctuating temporal availability. Trophic flexibility, coupled with broad physicochemical tolerances, enables these species to flourish in the challenging environment of intermittently open estuaries.

Additional keywords: carbon, dietary breadth, fish diets, food sources, nitrogen, organic matter.


Acknowledgements

This study was undertaken as G. L. R.’s Summer Scholarship with the Centre for Riverine Landscapes at Griffith University, with funding support from the Sustainable Tourism Cooperative Research Centre (Project No. 52003). Collections of fish and macroalgae were made under Scientific Collection Permit No. P02/0073 issued by New South Wales Fisheries, and Animal Ethics Permit No. AES/11/02/AEC issued by Griffith University. We thank Rene Diocares for running the isotope samples through the mass spectrometer. This manuscript benefited from comments and suggestions made by Christy Fellows, Harry Balcombe, Fran Sheldon, Janet Hussein, Sarra Hinshaw and two anonymous reviewers.


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