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Seven Mile Creek - Upstream Lake Powell

Basin : Denmark Coast

Catchment : Marbelup Brook

The condition of the Seven Mile Creek - Upstream Lake Powell site (site code: SEVE-01), in the lower catchment of Seven Mile Creek, was assessed between 10 and 11 November 2009, over a 100-m length of stream. At this time no previous assessments of river ecology had been reported.

The assessment was conducted using standard methods from the South West Index of River Condition. Measures chosen for this assessment included fish and crayfish, aquatic habitat, water quality (dissolved oxygen and temperature logged over 24h, and electrical conductivity, pH, colour, alkalinity, turbidity and nutrients), fringing vegetation, channel morphology, erosion, connectivity, local land use and flow.

Condition summary

The site was assessed as part of a national assessment of river condition – view report here.

An online condition summary for this site has not been prepared. Please contact the River Science Branch for site information, and see below for links to information on some of the species found at the site, and some images taken in November 2009.

Fish and crayfish

Three fish and three crayfish species were found at this site in November 2009:

  • Pseudogobius olorum (Swan River Goby)
  • Bostockia porosa (Nightfish)
  • Galaxias occidentalis (Western Minnow)
  • Cherax preissii (Koonac)
  • Cherax cainii (Marron – smooth)
  • Cherax quinquecarinatus (Gilgie)

Only fish and crayfish are targeted by sampling methods. Other species that were caught and/or observed are listed below:

  • Palaemon australis (South-west glass shrimp)
  • Chelodina oblonga (South-western snake-necked turtle)

Click on the images below to learn more.

Species found in subcatchment

This includes all species found within the subcatchment of the assessment site, from this and previous studies in the area. The photos are linked to more information about each species, including maps of where they are expected across the south-west.

Explore other sites in the catchment