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Government of Western Australia Department of Water and Environmental Regulation
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There are 166 estuaries in Western Australia as established through the National Land and Water Resources Audit (NLWRA) 2000, where an estuary is defined as

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Fish and crayfish

Western pygmy perchA significant amount of the value we place on our of rivers, streams and estuaries centres on their iconic fish and crayfish species, both in terms of the species we target recreationally (such as black bream, marron and prawns) and also as indicators of river health (including negative aspects such as fish kill events). Collecting data on fish and crayfish allows us to monitor these values.

Fish and crayfish are good indicators of river and estuarine condition as they are often top predators and keystone species within the trophic structure, which means that they are closely linked with the overall health of the system. Monitoring the species dynamics, such as changes in species composition, abundance, diversity, health and condition can provide valuable information relating to system health. This can extend to indications of previous disturbance, current condition, including factors such as water and sediment quality, aquatic and riparian vegetation, habitat, barriers to connectivity, altered flow regime and catchment disturbance and overall system stability.

In many cases, monitoring fish and crayfish can provide information which is not captured by other variables. For instance, a reduction or loss of a species which is known to be sensitive to low dissolved oxygen may highlight an underlying problem that may not have been detected by snapshot water quality sampling. For example, low oxygen conditions occurring only in the early morning due to algal blooms, which produce oxygen during the day and consume it during the night. Similarly, a change in age demographic of fish species may highlight an issue with their ability to reproduce, such as a barrier impeding migration of adult fish upstream to breeding grounds.

Fish and crayfish data can also highlight problems stemming from a combination of stressors. That is, where small changes in a number of factors can lead to a large effect on the health of the environment.  Different species have different sensitivities to the range of stressors that are known to occur in Western Australian systems, including salinisation, sedimentation, algal blooms, declining water and sediment quality, removal of habitat and altered flow regime.  Monitoring individual species can help determine what stressors are impacting the system.Marron

For more information relating to understanding the health of our waterways refer to information provided in pages assessing river health and assessing estuary health.

Page last updated - 15 Apr 2015
Related publications

Fish fauna of the Swan-Canning Estuary

Fish diets and food webs in the Swan-Canning Estuary

The Framework for the Assessment of River and Wetland Health (FARWH) for flowing rivers of south-west Western Australia: project summary and results

• The Framework for the Assessment of River and Wetland Health (FARWH) for flowing rivers of south-west Western Australia: method development

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The Department of Water and Environmental Regulation was established by the Government of Western Australia on 1 July 2017. It is a result of the amalgamation of the Department of Environment Regulation, Department of Water and the Office of the Environmental Protection Authority. This website/publication may contain references to previous government departments and programs. Please contact the Department of Water and Environmental Regulation to clarify any specific information.

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