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University of Canberra

1. Peterson, Kylie. Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin.

Degree: 2003, University of Canberra

Six rivers within the upper Mumbidgee catchment were sampled for larval and juvenile fish. The rivers represented both regulated and unregulated flow regimes and varied widely in size. There was wide variation in the larval fish communities supported by each river, both in terms of the species diversity and total abundance of fish sampled. The highly regulated reach of the Mumbidgee River sampled during this study had the highest numbers of native species and native individuals of any river sampled. In the two rivers selected for further study, the Murmmbidgee and Goodradigbee, there was a high level of inter-annual consistency in the species composition within the reaches sampled, despite considerable change in the temperature and flow regimes of both rivers. This indicates that at least some spawning of those species sampled may occur each year, regardless of environmental conditions. Estimates of the relative abundance of each species sampled changed markedly between years, and it is argued, on the basis of growth information contained in the otoliths, that differential survival of larvae and juveniles was largely responsible for this shift in relative abundance. Otolith microstructure provided information on the date of spawning and early growth patterns of all species sampled in the upper Mumumbidgee catchment. In addition to determining the age and thus 'birth-date' of an individual, the effect of a particular event or series of events has on growth, and subsequent survival, is permanently recorded in the otolith microstructure. This enables accurate back-calculation and correlation to management actions or natural events. No other research tool has this ability to retrospectively assess, on a daily basis, the impacts of management actions on condition and subsequent survival of fish larvae. Species sampled could be separated into three groups based on spawning requirements; those linked with flow, those linked with temperature and generalist species that appear to have river independent cues, such as photoperiod or moon phase. Patterns in growth rate during the early life history stages enabled quantification of the consequences of variation in environmental conditions on the survival and recruitment of various species. Growth was not always highly correlated with water temperature, in fact, for mountain galaxias, high temperatures appear to negatively affect larval condition and subsequent survival. Conversely, carp exhibited a strategy more consistent with common perceptions, with growth and survival increasing with increasing temperature. The study uncovered spawning and growth patterns that were unexpected. Age analysis of western carp gudgeon demonstrated that they had undertaken a mid-winter spawning, when the water temperature in the main channel was far lower than that at which spawning was previously recorded for this species. Redfin perch from the unregulated…

Subjects/Keywords: environmental impact; fish larvae; Murray-Darling Basin; Murrumbidgee River; Goodradigbee River; ecology; mountain galaxias; Galaxias olidus; carp; Cyprinus carpio; redfin perch; Perca fluviatilis; Australian smelt; Retropinna semoni; western carp gudgeon; Hypseleotris klunzingeri; gambusia; Gambusia holbrooki

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APA (6th Edition):

Peterson, K. (2003). Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin. (Thesis). University of Canberra. Retrieved from http://erl.canberra.edu.au./public/adt-AUC20060713.121419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Peterson, Kylie. “Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin.” 2003. Thesis, University of Canberra. Accessed August 17, 2019. http://erl.canberra.edu.au./public/adt-AUC20060713.121419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Peterson, Kylie. “Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin.” 2003. Web. 17 Aug 2019.

Vancouver:

Peterson K. Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin. [Internet] [Thesis]. University of Canberra; 2003. [cited 2019 Aug 17]. Available from: http://erl.canberra.edu.au./public/adt-AUC20060713.121419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Peterson K. Environmental impacts on spawning and survival of fish larvae and juveniles in an upland river system of the Murray-Darling Basin. [Thesis]. University of Canberra; 2003. Available from: http://erl.canberra.edu.au./public/adt-AUC20060713.121419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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