Water Electrical Conductivity (EC)

AUS-TMI-AQU-WEC General Moderate confidence

Benchmark Value

No specific value — see range
Range: 3E+04 to 5.4E+04 µS/cm
Optimal Range: 3E+04 to 5.4E+04
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 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Evidence & Context

The following benchmark is derived from a synthesis of the natural ambient water quality in Australia's tropical maritime islands and the optimal physiological requirements of key sustainable aquaculture species.

Metric Definition:

Water Electrical Conductivity (EC) is a measure of the ability of water to conduct an electrical current, directly proportional to dissolved ionic substances concentration, serving as a proxy for Total Dissolved Solids (TDS) and salinity.

Benchmark Definition:

The optimal range of water electrical conductivity supports the health of diverse tropical marine species and reflects the natural salinity of high-quality coastal waters in the region.

Justification:

The benchmark synthesizes natural ambient water quality and species physiological requirements to represent a sustainable aquaculture condition with minimal stress.

Sources (1)

Preview of "Water Resources of the Tiwi Islands" (NT Dept. of Infrastructure, Planning and Environment, 2003)
"Water Resources of the Tiwi Islands" (NT Dept. of Infrastructure, Planning and Environment, 2003)
View Source

Supporting Sources (26)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Growth Performance and Survivability of the Asian Seabass Lates Calcarifer Reared Under Hyper-Saline, Hypo-Saline and Freshwater Environments in a Closed Aquaculture System - ResearchGate, accessed August 1, 2025
(PDF) Growth Performance and Survivability of the Asian Seabass Lates Calcarifer Reared Under Hyper-Saline, Hypo-Saline and Freshwater Environments in a Closed Aquaculture System - ResearchGate, accessed August 1, 2025
Contextual Support Journal

(PDF) Growth Performance and Survivability of the Asian Seabass Lates Calcarifer Reared Under Hyper-Saline, Hypo-Saline and Freshwater Environments in a Closed Aquaculture System - ResearchGate, accessed August 1, 2025

View Source
Preview of AQUACULTURE development opportunities - Develop Tiwi, accessed August 1, 2025
AQUACULTURE development opportunities - Develop Tiwi, accessed August 1, 2025
Contextual Support Journal

AQUACULTURE development opportunities - Develop Tiwi, accessed August 1, 2025

View Source
Preview of Australia's bioregions (IBRA) - DCCEEW, accessed July 15, 2025
Australia's bioregions (IBRA) - DCCEEW, accessed July 15, 2025
Contextual Support

Interim Biogeographic Regionalisation for Australia (IBRA), Version 7 (Regions)

View Source
Preview of Barramundi Farming For Beginners - Google Sites, accessed July 25, 2025,
Barramundi Farming For Beginners - Google Sites, accessed July 25, 2025,
Contextual Support GreyLiterature

Filtration rate and bioremediatory potential of the tropical blacklip rock oyster >Saccostrea >lineage J - Charles Darwin University, accessed August 1, 2025

View Source
Preview of Barramundi Farming Handbook - Homepage | Department of Trade, Business and Asian Relations, accessed August 1, 2025
Barramundi Farming Handbook - Homepage | Department of Trade, Business and Asian Relations, accessed August 1, 2025
Contextual Support Journal

Barramundi Farming Handbook - Homepage | Department of Trade, Business and Asian Relations, accessed August 1, 2025

View Source
Preview of BIODIVERSITY CONSERVATION ON THE TIWI ISLANDS ..., accessed August 1, 2025
BIODIVERSITY CONSERVATION ON THE TIWI ISLANDS ..., accessed August 1, 2025
Contextual Support Government

Torres Strait fishers expand their skills and vision | FRDC, accessed August 1, 2025

View Source
Preview of BIODIVERSITY CONSERVATION ON THE TIWI ISLANDS, NORTHERN TERRITORY: Part 1. Environments and plants, accessed July 30, 2025,
BIODIVERSITY CONSERVATION ON THE TIWI ISLANDS, NORTHERN TERRITORY: Part 1. Environments and plants, accessed July 30, 2025,
Contextual Support Journal

Plantation Forestry and Economic Development in the Tiwi Islands

View Source
Preview of Broodstock conditioning techniques, filtration rate and bioremediatory ability of the tropical Blacklip rock oyster (Saccostrea - ResearchOnline@JCU, accessed August 1, 2025
Broodstock conditioning techniques, filtration rate and bioremediatory ability of the tropical Blacklip rock oyster (Saccostrea - ResearchOnline@JCU, accessed August 1, 2025
Direct Evidence Journal

Broodstock conditioning techniques, filtration rate and bioremediatory ability of the tropical Blacklip rock oyster (Saccostrea - ResearchOnline@JCU, accessed August 1, 2025

View Source
Preview of Can Blacklip Rock oysters reduce nutrient pollution near the Great Barrier Reef?, accessed August 1, 2025
Can Blacklip Rock oysters reduce nutrient pollution near the Great Barrier Reef?, accessed August 1, 2025
Contextual Support Journal

Can Blacklip Rock oysters reduce nutrient pollution near the Great Barrier Reef?, accessed August 1, 2025

View Source
Preview of CSIRO collaborates with Indigenous-centred prawn farm on Tiwi Islands | The Fish Site, accessed August 1, 2025
CSIRO collaborates with Indigenous-centred prawn farm on Tiwi Islands | The Fish Site, accessed August 1, 2025
Contextual Support Government

CSIRO collaborates with Indigenous-centred prawn farm on Tiwi Islands | The Fish Site, accessed August 1, 2025

View Source
Preview of CSIRO collaborates with Indigenous-centred prawn farm on Tiwi Islands | The Fish Site, accessed July 27, 2025,
CSIRO collaborates with Indigenous-centred prawn farm on Tiwi Islands | The Fish Site, accessed July 27, 2025,
Contextual Support GreyLiterature

Aboriginal aquaculture | Department of Agriculture and Fisheries, accessed August 1, 2025

View Source
Preview of Effects of Different Levels of Salinity on NKA and NKCC Expression in Asian Sea Bass (Lates calcarifer) - Turkish Journal of Fisheries and Aquatic Sciences, accessed August 1, 2025
Effects of Different Levels of Salinity on NKA and NKCC Expression in Asian Sea Bass (Lates calcarifer) - Turkish Journal of Fisheries and Aquatic Sciences, accessed August 1, 2025
Methodology Source GreyLiterature

Effects of Different Levels of Salinity on NKA and NKCC Expression in Asian Sea Bass (Lates calcarifer) - Turkish Journal of Fisheries and Aquatic Sciences, accessed August 1, 2025

View Source
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

View Source
Preview of Growth performance, survival rate and economic efficiency of barramundi cultured in HDPE-lined ponds with high densities - Bioflux
Growth performance, survival rate and economic efficiency of barramundi cultured in HDPE-lined ponds with high densities - Bioflux
Contextual Support Journal

Inland Aquaculture | EPA SA, accessed July 25, 2025,

View Source
Preview of Indigenous-centred prawn farm collaboration to make a splash on Tiwi Islands - CSIRO, accessed July 27, 2025,
Indigenous-centred prawn farm collaboration to make a splash on Tiwi Islands - CSIRO, accessed July 27, 2025,
Contextual Support Government

Unlocking aquaculture potential in Australia's Top End - CSIRO, accessed August 1, 2025

View Source
Preview of Lord Howe Island Marine Park - NSW Department of Primary Industries, accessed August 4, 2025,
Lord Howe Island Marine Park - NSW Department of Primary Industries, accessed August 4, 2025,
Contextual Support Government

Making waves in aquaculture: Isaak Kadel's journey - CSIRO, accessed August 1, 2025

View Source
Preview of Lord Howe Island Marine Park - Wikipedia, accessed August 3, 2025,
Lord Howe Island Marine Park - Wikipedia, accessed August 3, 2025,
Contextual Support GreyLiterature

Lord Howe Island Marine Park - Wikipedia, accessed August 1, 2025

View Source
Preview of Measuring Salinity of Water - HORIBA, accessed August 1, 2025
Measuring Salinity of Water - HORIBA, accessed August 1, 2025
Methodology Source GreyLiterature

Measuring Salinity of Water - HORIBA, accessed August 1, 2025

View Source
Preview of Measuring salinity, TDS and conductivity.
Measuring salinity, TDS and conductivity.
Contextual Support GreyLiterature

Assessing Future Flooding Risk in a Coastal Lagoon Using Hydrogeological Approaches and Analysis of the 2021 Flood Event: A Case Study of Tasi-Tolu Lagoon, Dili, Timor-Leste - Scirp.org., accessed August 1, 2025

View Source
Preview of Measuring salinity, TDS and conductivity., accessed August 1, 2025
Measuring salinity, TDS and conductivity., accessed August 1, 2025
Contextual Support

Measuring salinity, TDS and conductivity., accessed August 1, 2025

View Source
Preview of Salinity - Coastal Wiki, accessed August 1, 2025
Salinity - Coastal Wiki, accessed August 1, 2025
Contextual Support Government

5.3 Salinity Patterns – Introduction to Oceanography, accessed August 1, 2025

View Source
Preview of Salinity calculator - Reef App, accessed August 1, 2025
Salinity calculator - Reef App, accessed August 1, 2025
Contextual Support Government

Sea cucumber health and biosecurity for aquaculture development - CSIRO Research Publications Repository, accessed August 1, 2025

View Source
Preview of The most beautiful Australian islands - Tourism Australia, accessed August 2, 2025,
The most beautiful Australian islands - Tourism Australia, accessed August 2, 2025,
Contextual Support

The most beautiful Australian islands - Tourism Australia, accessed August 4, 2025,

View Source
Preview of The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate
The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate
Contextual Support GreyLiterature

The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate

View Source
Preview of Tiwi Islands celebrate milestone in Territory-grown oyster industry, accessed August 1, 2025
Tiwi Islands celebrate milestone in Territory-grown oyster industry, accessed August 1, 2025
Contextual Support Government

Tiwi Islands celebrate milestone in Territory-grown oyster industry, accessed August 1, 2025

View Source
Preview of VOLUME 1 WATER RESOURCES OF THE TIWI ... - Tiwi Land Council, accessed August 1, 2025
VOLUME 1 WATER RESOURCES OF THE TIWI ... - Tiwi Land Council, accessed August 1, 2025
Direct Evidence Journal

VOLUME 1 WATER RESOURCES OF THE TIWI ... - Tiwi Land Council, accessed August 1, 2025

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Maritime Islands
  • Land Use Aquaculture
  • Assessment Conservation Target
  • Season wet season (monsoon) and dry season
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 3 Jun 2026

Notes

Lower Critical Threshold: 15000 µS/cm. Upper Detrimental Threshold: 54000 µS/cm. The benchmark reflects full-strength, pristine seawater (35 ppt at 25°C), the primary water source for sustainable aquaculture in the region. Values above 54000 µS/cm indicate hypersaline conditions from poor management.