Margaret River Fishway
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In order to enhance the migrations of fish species in the Margaret River, the Margaret River Regional Environment Centre, in conjunction with the Department of Environment, constructed a rock ramp fishway at the Margaret River Weir (Apex Weir) between March and April 2003. Morgan and Beatty (2003) surveyed the fish fauna of the river during March 2003, capturing 9206 fish from five native species, one feral species and the pouched lamprey (Geotria australis) (see Plate 1). All of the native fishes of the river are endemic to south-western Australia while the feral species is the mosquitofish (Gambusia holbrooki). The only other records of fish from the river are those recorded by Morgan et al. (1998) and there are also a few records in the Western Australian Museum.
Large numbers of native fishes were known to be impeded by the town weir on their upstream migration during winter and spring. These native fishes included the western minnow (Galaxias occidentalis), western pygmy perch (Edelia vittata) and nightfish (Bostockia porosa). Furthermore, adult lampreys were often observed negotiating the weirs on Margaret River with the occasional dead animal also observed. The reservoir above the Margaret River Weir had the highest abundance of the feral mosquitofish with this section of the river also containing western minnows, nightfish and western pygmy perch, and beds for larval lampreys (ammocoetes) (Morgan and Beatty 2003). It was thus deemed appropriate that the construction of a fishway on the Margaret River would be beneficial to fish and lamprey migrations in the Margaret River.
|Murdoch Affiliation:||Centre for Fish and Fisheries Research|
|Series Name:||Murdoch University Report to the Margaret River Regional Environment Centre|
|Publisher:||Murdoch University. Centre for Fish & Fisheries Research|
|Copyright:||2004 Murdoch University. Centre for Fish & Fisheries Research|
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