Water Electrical Conductivity (EC)

AUS-TSW-AQU-WEC General Moderate confidence

Benchmark Value

1500 µS/cm

Direction: Lower is desirable ↓

Form: MinimumOnly

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

A proposed lower critical threshold is therefore set at < 1,500 µS/cm.

Metric Definition:

Lower critical threshold of Electrical Conductivity (EC) below which conditions become suboptimal for inland saline aquaculture.

Benchmark Definition:

This benchmark represents the maximum electrical conductivity level below which conditions become detrimental to cultured animals and system stability in inland saline aquaculture.

Justification:

Below this level, the water is functionally fresh and inconsistent with the definition of saline aquaculture, lacking sufficient ionic content for efficient osmoregulation and buffering capacity.

Sources (2)

Low water conductivity increases the effects of copper on the serum parameters in fish (Oreochromis niloticus) - PubMed Journal

Low water conductivity increases the effects of copper on the serum parameters in fish (Oreochromis niloticus) - PubMed

View Source

Preview of Water quality of surface water environments - NSW Government Water, accessed August 1, 2025,

Water quality of surface water environments - NSW Government Water, accessed August 1, 2025, Government

National Guidelines for Water Quality | Department of Natural ...

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,

Direct Evidence Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

View Source

Characterising the relationship between water quality and water quantity, accessed August 5, 2025

Direct Evidence Journal

Turbidity | Australia state of the environment 2021

View Source

Salinity | Land and soil - Environment and Heritage - NSW Government, accessed August 11, 2025

Direct Evidence Government

Australia state of the environment 2021: land, accessed July 28, 2025

View Source

Saltwater success inland: Exploring the potential of saline aquaculture | FRDC

Direct Evidence GreyLiterature

Inland Saline Aquaculture | FRDC

View Source

Context

Region Australia
Biome Temperate Semi-Arid Shrublands & Open Woodlands
Land Use Aquaculture
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 5 Jun 2026

Notes

This value aligns with the threshold at which adverse biological effects begin to manifest in general freshwater ecosystems. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TSW-AQU-WEC family.