Water Electrical Conductivity (EC)

AUS-AIF-AQU-WEC General High confidence

Benchmark Value

No specific value — see range

Range: 20 to 400 µS/cm

Thresholds: Lower: 20, Upper: 800

Optimal Range: 20 to 400

Direction: Lower is desirable ↓

Form: OptimalRange

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 13 benchmarks together — the OptimalRange form drives the primary score, while 12 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary OptimalRange Guard MinimumOnly Guard MaximumOnly Guard Point Guard MinimumOnly Guard MaximumOnly Guard Point Guard OptimalRange Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard

Evidence & Context

Therefore, the proposed benchmark for the best available condition is the range of 20 – 400 µS/cm.

Metric Definition:

Water Electrical Conductivity (EC) in water used for aquaculture in Australian Arid Inland Floodplains & Ephemeral River Systems.

Benchmark Definition:

This benchmark defines the optimal range of water electrical conductivity for sustainable aquaculture in the Arid Inland Floodplains & Ephemeral River Systems biome, balancing minimal osmotic stress to native species with sufficient minerals to support productivity.

Justification:

This range is supported by natural median EC in healthy waterholes (150-300 µS/cm), species-specific aquaculture data for Silver Perch (20-400 µS/cm), and the MDBA's upper limit for low salinity water (800 µS/cm).

Sources (3)

Preview of Influences of salinity, water quality and hydrology on early life stages of fishes in the Lower River Murray, South Australia.

Influences of salinity, water quality and hydrology on early life stages of fishes in the Lower River Murray, South Australia. GreyLiterature

Salinity - Murray–Darling Basin Authority, accessed July 20, 2025,

Preview of Salinity - Murray–Darling Basin Authority, accessed August 11, 2025,

Salinity - Murray–Darling Basin Authority, accessed August 11, 2025, Government

Salinity | Murray–Darling Basin Authority

Preview of Water quality | Murray–Darling Basin Authority, accessed August 5, 2025

Water quality | Murray–Darling Basin Authority, accessed August 5, 2025

(PDF) Water quality in two Australian dryland rivers: spatial and ..., accessed July 20, 2025,

Supporting Sources (24)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Inland saline aquaculture - ResearchGate, accessed July 20, 2025,

(PDF) Inland saline aquaculture - ResearchGate, accessed July 20, 2025,

Contextual Support GreyLiterature

(PDF) Inland saline aquaculture - ResearchGate, accessed July 20, 2025,

Preview of (PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

(PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

Direct Evidence

(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

Preview of 3. Conductivity/Salinity - Site Selection For Aquaculture : chemical features of water, accessed July 20, 2025,

3. Conductivity/Salinity - Site Selection For Aquaculture : chemical features of water, accessed July 20, 2025,

Methodology Source Government

Electrical conductivity of water, part 2 - Responsible Seafood Advocate, accessed July 20, 2025,

Preview of Australia - Brackish Water Aquaculture, accessed July 20, 2025,

Australia - Brackish Water Aquaculture, accessed July 20, 2025,

Contextual Support GreyLiterature

SA Arid Lands Landscape Regional Summary 2022 Aquatic ...

Preview of Best Pratice Environmental Management Guidelines for ... - VFA, accessed July 20, 2025,

Best Pratice Environmental Management Guidelines for ... - VFA, accessed July 20, 2025,

Contextual Support Government

Best Pratice Environmental Management Guidelines for ... - VFA

Preview of Development of a Health Management Strategy for the Silver Perch Aquaculture Industry., accessed July 20, 2025,

Development of a Health Management Strategy for the Silver Perch Aquaculture Industry., accessed July 20, 2025,

Contextual Support Government

The influence of saline concentration on the success of Calcein marking techniques for hatchery-produced Murray cod (Maccullochella peelii), accessed July 20, 2025,

Preview of Electrical conductivity of water, part 2 - Responsible Seafood Advocate

Electrical conductivity of water, part 2 - Responsible Seafood Advocate

Contextual Support GreyLiterature

Conductivity in Aquaculture, Agriculture, & Hydroponics - AlpHa Measure, accessed August 1, 2025

Preview of Inland Saline Aquaculture - Australian Centre for International Agricultural Research, accessed July 20, 2025,

Inland Saline Aquaculture - Australian Centre for International Agricultural Research, accessed July 20, 2025,

Contextual Support

Australia - Brackish Water Aquaculture, accessed July 25, 2025

Preview of Inland Saline Aquaculture | FRDC, accessed July 20, 2025,

Inland Saline Aquaculture | FRDC, accessed July 20, 2025,

Contextual Support Government

Inland Saline Aquaculture | FRDC, accessed July 25, 2025,

Preview of Inland Saline Aquaculture: Overcoming Biological and Technical Constraints Towards the Development of an Industry. - Murdoch Research Portal, accessed July 20, 2025,

Inland Saline Aquaculture: Overcoming Biological and Technical Constraints Towards the Development of an Industry. - Murdoch Research Portal, accessed July 20, 2025,

Contextual Support Journal

National Aquaculture Statement - DAFF, accessed July 20, 2025,

Preview of Inland water - Australia state of the environment 2021, accessed July 20, 2025

Inland water - Australia state of the environment 2021, accessed July 20, 2025

Contextual Support Journal

Land-based aquaculture - Department of Primary Industries and Regions South Australia - PIRSA, accessed July 20, 2025,

Preview of Inland waters - CSIRO Publishing, accessed July 20, 2025

Inland waters - CSIRO Publishing, accessed July 20, 2025

Contextual Support GreyLiterature

Resilience of floodplain ecosystems in a semi-arid environment - CSIRO Publishing, accessed July 20, 2025,

Preview of Land-based aquaculture - Department of Primary Industries and Regions South Australia - PIRSA, accessed July 20, 2025,

Land-based aquaculture - Department of Primary Industries and Regions South Australia - PIRSA, accessed July 20, 2025,

Contextual Support Government

Murray Cod | Department of Primary Industries, accessed July 20, 2025,

Preview of Murray Cod | Department of Primary Industries, accessed July 20, 2025,

Murray Cod | Department of Primary Industries, accessed July 20, 2025,

Contextual Support Government

Australia - Brackish Water Aquaculture, accessed July 20, 2025,

Preview of Murray Cod Aquaponics - HowtoAquaponic, accessed July 20, 2025,

Murray Cod Aquaponics - HowtoAquaponic, accessed July 20, 2025,

Contextual Support GreyLiterature

Murray Cod Aquaponics - HowtoAquaponic, accessed July 20, 2025,

Preview of National Aquaculture Statement - DAFF, accessed July 20, 2025,

National Aquaculture Statement - DAFF, accessed July 20, 2025,

Contextual Support

NSW Land Based Sustainable Aquaculture Strategy | Department of ..., accessed July 20, 2025,

Preview of NSW Land Based Sustainable Aquaculture Strategy | Department of ..., accessed July 20, 2025,

NSW Land Based Sustainable Aquaculture Strategy | Department of ..., accessed July 20, 2025,

Contextual Support Government

Strategies for promoting sustainable aquaculture in arid and semi-arid areas, accessed July 20, 2025,

Preview of Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 18, 2025,

Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 18, 2025,

Contextual Support Journal

Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research

Preview of Potential Environmental Impacts From Farming Rainbow Trout Using Inland Saline Water in Western Australia - ResearchGate, accessed July 20, 2025,

Potential Environmental Impacts From Farming Rainbow Trout Using Inland Saline Water in Western Australia - ResearchGate, accessed July 20, 2025,

Contextual Support Journal

Potential Environmental Impacts From Farming Rainbow Trout Using Inland Saline Water in Western Australia - ResearchGate, accessed July 20, 2025,

Preview of Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,

Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,

Contextual Support Journal

Quantifying Health in Ephemeral Rivers - eWater

Preview of Resilience of floodplain ecosystems in a semi-arid environment - CSIRO Publishing, accessed July 20, 2025,

Resilience of floodplain ecosystems in a semi-arid environment - CSIRO Publishing, accessed July 20, 2025,

Contextual Support Journal

Creating a sustainable Murray-Darling - The Nature Conservancy Australia, accessed July 20, 2025

Preview of Strategies for promoting sustainable aquaculture in arid and semi-arid areas, accessed July 20, 2025,

Strategies for promoting sustainable aquaculture in arid and semi-arid areas, accessed July 20, 2025,

Contextual Support

Recirculating aquaculture systems (RAS): Environmental solution and climate change adaptation - Find an Expert - The University of Melbourne, accessed July 25, 2025

Preview of The influence of saline concentration on the success of Calcein marking techniques for hatchery-produced Murray cod (Maccullochella peelii), accessed July 20, 2025,

The influence of saline concentration on the success of Calcein marking techniques for hatchery-produced Murray cod (Maccullochella peelii), accessed July 20, 2025,

Contextual Support

The influence of saline concentration on the success of Calcein marking techniques for hatchery-produced Murray cod (Maccullochella peelii), accessed July 20, 2025,

Preview of Water quality | Australia state of the environment 2021, accessed August 11, 2025,

Water quality | Australia state of the environment 2021, accessed August 11, 2025,

Contextual Support Government

Drivers of water quality in Afromontane-savanna rivers - Frontiers

Context

Region Australia
Biome Arid Inland Floodplains & Ephemeral River Systems
Land Use Aquaculture
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 1 Jun 2026

Notes

Lower critical threshold is ~20 µS/cm due to mineral deficiency risks; optimal range balances productivity and ecological health; upper detrimental threshold is 800 µS/cm based on MDBA's low salinity classification indicating degradation risk above this. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.