Journal
FISHERIES MANAGEMENT AND ECOLOGY
Volume 10, Issue 4, Pages 209-220Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-2400.2003.00337.x
Keywords
aquatic macrophytes; coarse woody debris; fish community
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Fish assemblages in six reaches of the Hawkesbury-Nepean River were studied to identify the effects of two types of riparian vegetation; well-vegetated banks supporting complex flora dominated by trees and shrubs, and grassed banks, that have been colonised only by grasses after historical deforestation. The fish assemblages showed both spatial and temporal differences and habitats adjacent to grassed banks supported more individuals and more fish species than well-vegetated banks. Three small species of fish, firetail gudgeon, Hypseleotris galii (Ogilby), flathead gudgeon, Philypnodon grandiceps (Krefft), and empire gudgeon, Hypseleotris compressa (Krefft), occurred in greater abundances adjacent to grassed banks, but freshwater mullet, Myxus petardi (Castelnau), were less abundant near grassed banks than beside well-vegetated banks. Differences were also shown in the size frequencies of the four larger fish species between riparian vegetation types. The observed differences in the distributions of fish species appeared to be related to the greater abundance aquatic macrophytes near grassed banks, probably an effect of shading of macrophytes near well-vegetated banks.
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