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<meta content="Stuart-Smith, Rick D." name="eprints.creators_name" />
<meta content="Richardson, A.M.M." name="eprints.creators_name" />
<meta content="White, R.W.G." name="eprints.creators_name" />
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<meta content="2007-08-13" name="eprints.datestamp" />
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<meta content="Daphnia carinata, feeding, Galaxias auratus, Tasmanian lake, trophic adaptability." name="eprints.keywords" />
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<meta content="The stomach contents of adult brown trout Salmo trutta from Lake Sorell, Tasmania, were
analysed during 6 years of increasing turbidity to follow changes in the diet associated with
dramatic changes in water clarity. Brown trout were sampled from 1996, when turbidity was 26
NTU, to 2001 when turbidity was 141NTU. The mean relative volume of stomach contents
decreased progressively to 2001, by which time it was only one sixth of that in 1996, and the mean
diversity of prey in stomachs decreased from an average of more than six species per stomach in
1996 to one species in 2001. The species composition of stomach contents shifted from domination
by the phreatoicid isopod Colubotelson sp., to the galaxiid fish Galaxias auratus and the
amphipod Austrochiltonia australis, and then the cladoceran Daphnia carinata. To give an
indication of diet changes over a typical yearly cycle in the current turbid state of the lake, a
sample was taken from each season from December 2000 to September 2001. Two basic diets
were found during the year; brown trout specialized on D. carinata in summer and autumn, and
G. auratus in winter and spring. Mean diversity of prey was less than two species per stomach in
all samples from 2000 to 2001, except for the sample from spring 2001 when it was 22 species per
stomach, and the mean relative volume of stomach contents was more than three times greater in
winter than any other season. The ways in which high turbidity may have influenced the changes
in the brown trout diet observed since 1996 and the patterns evident during the seasons of
2000-2001 are discussed." name="eprints.abstract" />
<meta content="2004" name="eprints.date" />
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<meta content="Journal of Fish Biology" name="eprints.publication" />
<meta content="65" name="eprints.volume" />
<meta content="376-388" name="eprints.pagerange" />
<meta content="10.1111/j.0022-1112.2004.00456.x" name="eprints.id_number" />
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<meta content="http://dx.doi.org/10.1111/j.0022-1112.2004.00456.x" name="eprints.official_url" />
<meta content="Ball, R. C. (1948). Relationship between available fish food, feeding habits of fish and
total fish production in a Michigan lake. Michigan Technical Bulletin 206, 3-59.
Barrett, J. C. (1992). Turbidity-induced changes in reactive distance of rainbow trout.
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Berg, L. & Northcote, T. G. (1985). Changes in territorial, gill-flaring, and feeding
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pulses of suspended sediment. Canadian Journal of Fisheries and Aquatic Sciences
42, 1410-1417.
Borgstrom, R. (1973). The effect of increased water level fluctuation upon the brown
trout population of Marvann, a Norwegian reservoir. Norwegian Journal of
Zoology 21, 101-112.
Bridcut, E. E. & Giller, P. S. (1993). Diet variability in relation to season and habitat
utilisation in brown trout, Salmo trutta L., in a southern Irish stream. Canadian
Special Publications of Fisheries and Aquatic Sciences 118, 17-24.
Cheng, D. M. H. & Tyler, P. A. (1976). Primary productivity and nutrient status of Lakes
Sorell and Crescent, Tasmania. Hydrobiologia 48, 59-64.
Cortes, E. (1997). A critical review of methods of studying fish feeding based on analysis
of stomach contents: application to elasmobranch fishes. Canadian Journal of
Fisheries and Aquatic Sciences 54, 726-738.
Dill, L. M. (1983). Adaptive flexibility in the foraging behaviour of fishes. Canadian
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Dorgeloh, W. G. (1995). Fish distribution in relation to turbidity gradients in a man-made
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Gerking, S. D. (1994). Feeding Ecology of Fish. San Diego, CA: Academic Press.
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by juvenile chinook salmon (Oncorhynchus tshawytscha) in turbid laboratory
conditions. Canadian Journal of Fisheries and Aquatic Sciences 50, 233-240.
Hayes, J. W. & Rutledge, M. J. (1991). Relationship between turbidity and fish diets in
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North Wales. Journal of Fish Biology 4, 333-352.
Hyatt, K. D. (1979). Feeding strategy. In Fish Physiology, Vol. VIII (Hoar, W. S.,
Randall, D. J. & Brett, J. R., eds), pp. 71-119. London: Academic Press.
Hyslop, E. J. (1980). Stomach contents analysis - a review ofmethods and their application.
Journal of Fish Biology 17, 411-429.
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on trout populations in littoral zones of New Zealand alpine lakes. New Zealand
Journal of Marine and Freshwater Research 36, 39-52.
Johnsen, B. O. (1978). Seasonal variations in the diet of the brown trout (Salmo trutta L.)
in a Norwegian mountain lake compared with the variations in the plankton and
bottom fauna. Astarte 11, 37-43.
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dynamics of brown trout, Salmo trutta L., in a small nursery stream. Aquaculture
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brown trout (Salmo trutta Fario L.) in Aspropotamos Stream, Greece. Polskie
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juvenile migrant stage of six New Zealand freshwater fish species. New Zealand
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Rowe, D. K., Dean, T. L., Williams, E. & Smith, J. P. (2003). Effects of turbidity on the
ability of juvenile rainbow trout, Oncorhynchus mykiss, to feed on limnetic and
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distance of the Bluegill (Lepomis macrochirus). Journal of the Fisheries Research
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brown trout, Salmo trutta, in the littoral zone of Lake Selura, Norway. Archiv fur
Hydrobiologie 105, 177-185.
Windell, J. T. & Bowen, S. H. (1978). Methods for study of fish diets based on analysis of
stomach contents. In Methods for Assessment of Fish Production in Fresh waters,
3rd edn (Bagenal, T., ed.), pp. 219-226. Oxford: Blackwell Scientific Publications.
Yevsin, V. N. & Ivanov, N. O. (1979). The summer feeding of brown trout, Salmo trutta,
in the Pulon'ga River (Kola Peninsula). Journal of Ichthyology 19, 122-126.
Hardie, S. A. (2003a). Current status of the macroinvertebrate communities in Lakes
Crescent and Sorell. Inland Fisheries Service. http://www.ifs.tas.gov.au, 29 October
2003.
Hardie, S. A. (2003b). Current status and ecology of the golden galaxies (Galaxias
auratus). Inland Fisheries Service. http://www.ifs.tas.gov.au, 29 October 2003.
Heffer, D. K. (2003). Wetlands of Lakes Sorell and Crescent: conservation and
management. Inland Fisheries Service. http://www.ifs.tas.gov.au, 29 October 2003.
Uytendaal, A. (2003). Water quality in Lakes Sorell and Crescent: Underlying processes
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29 October 2003." name="eprints.referencetext" />
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<meta content="The stomach contents of adult brown trout Salmo trutta from Lake Sorell, Tasmania, were
analysed during 6 years of increasing turbidity to follow changes in the diet associated with
dramatic changes in water clarity. Brown trout were sampled from 1996, when turbidity was 26
NTU, to 2001 when turbidity was 141NTU. The mean relative volume of stomach contents
decreased progressively to 2001, by which time it was only one sixth of that in 1996, and the mean
diversity of prey in stomachs decreased from an average of more than six species per stomach in
1996 to one species in 2001. The species composition of stomach contents shifted from domination
by the phreatoicid isopod Colubotelson sp., to the galaxiid fish Galaxias auratus and the
amphipod Austrochiltonia australis, and then the cladoceran Daphnia carinata. To give an
indication of diet changes over a typical yearly cycle in the current turbid state of the lake, a
sample was taken from each season from December 2000 to September 2001. Two basic diets
were found during the year; brown trout specialized on D. carinata in summer and autumn, and
G. auratus in winter and spring. Mean diversity of prey was less than two species per stomach in
all samples from 2000 to 2001, except for the sample from spring 2001 when it was 22 species per
stomach, and the mean relative volume of stomach contents was more than three times greater in
winter than any other season. The ways in which high turbidity may have influenced the changes
in the brown trout diet observed since 1996 and the patterns evident during the seasons of
2000-2001 are discussed." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Increasing turbidity significantly alters the diet of brown trout: a multi-year longitudinal study</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Stuart-Smith, Rick D.</span> and <span class="person_name">Richardson, A.M.M.</span> and <span class="person_name">White, R.W.G.</span> (2004) <xhtml:em>Increasing turbidity significantly alters the diet of brown trout: a multi-year longitudinal study.</xhtml:em> Journal of Fish Biology, 65 . pp. 376-388. ISSN 0022-1112</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1598/1/honours_paper.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1598/1/honours_paper.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />268Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2063" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1111/j.0022-1112.2004.00456.x">http://dx.doi.org/10.1111/j.0022-1112.2004.00456.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The stomach contents of adult brown trout Salmo trutta from Lake Sorell, Tasmania, were
analysed during 6 years of increasing turbidity to follow changes in the diet associated with
dramatic changes in water clarity. Brown trout were sampled from 1996, when turbidity was 26
NTU, to 2001 when turbidity was 141NTU. The mean relative volume of stomach contents
decreased progressively to 2001, by which time it was only one sixth of that in 1996, and the mean
diversity of prey in stomachs decreased from an average of more than six species per stomach in
1996 to one species in 2001. The species composition of stomach contents shifted from domination
by the phreatoicid isopod Colubotelson sp., to the galaxiid fish Galaxias auratus and the
amphipod Austrochiltonia australis, and then the cladoceran Daphnia carinata. To give an
indication of diet changes over a typical yearly cycle in the current turbid state of the lake, a
sample was taken from each season from December 2000 to September 2001. Two basic diets
were found during the year; brown trout specialized on D. carinata in summer and autumn, and
G. auratus in winter and spring. Mean diversity of prey was less than two species per stomach in
all samples from 2000 to 2001, except for the sample from spring 2001 when it was 22 species per
stomach, and the mean relative volume of stomach contents was more than three times greater in
winter than any other season. The ways in which high turbidity may have influenced the changes
in the brown trout diet observed since 1996 and the patterns evident during the seasons of
2000-2001 are discussed.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available at www.blackwell-synergy.com</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Daphnia carinata, feeding, Galaxias auratus, Tasmanian lake, trophic adaptability.</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270701.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270701 Freshwater Ecology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1598</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mr Rick D. Stuart-Smith</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">13 Aug 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">12 Feb 2008 11:05</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1598;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1598">item control page</a></p>
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