Water Turbidity

AUS-TSR-AQU-WTU General Moderate confidence

Benchmark Value

5 NTU
Thresholds: Lower: —, Upper: 5
Direction: Lower is desirable ↓
Form: MaximumOnly

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 3 benchmarks together — the Point form drives the primary score, while 2 guard(s) constrain the result.

Contributing Benchmarks

Point Primary MaximumOnly Guard MaximumOnly Guard

Evidence & Context

A value of < 5 NTU as a median ambient water quality target is a robust and defensible benchmark.

Metric Definition:

Water turbidity measured in Nephelometric Turbidity Units (NTU) representing median ambient water quality in aquaculture systems.

Benchmark Definition:

This benchmark represents the median ambient water quality achievable in a best-practice, sustainable aquaculture system in tropical and subtropical rainforests.

Justification:

It is derived by synthesizing national water quality guidelines (ANZG 2018) with data from pristine reference streams in the tropical rainforest biome, which show baseflow turbidity is typically < 2 NTU. This value allows for minor productive turbidity from phytoplankton while remaining far below detrimental thresholds.

Sources (3)

Preview of Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,
Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025, Journal

Assessing water quality - ACT Waterwatch

View Source
Preview of Default guideline values - Water Quality Australia, accessed August 12, 2025
Default guideline values - Water Quality Australia, accessed August 12, 2025 Government

ANZECC (2000) Australian and New Zealand Guidelines for Fresh and Marine Water Quality.

View Source
Preview of Top-down and bottom-up effects in a tropical stream food web
Top-down and bottom-up effects in a tropical stream food web
View Source

Supporting Sources (25)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Community uses and values of water informing water quality improvement planning: a study from the Great Barrier Reef region, Australia - ResearchGate, accessed July 21, 2025,
(PDF) Community uses and values of water informing water quality improvement planning: a study from the Great Barrier Reef region, Australia - ResearchGate, accessed July 21, 2025,
Contextual Support Journal

(PDF) Community uses and values of water informing water quality improvement planning: a study from the Great Barrier Reef region, Australia - ResearchGate, accessed July 21, 2025,

View Source
Preview of (PDF) Water quality monitoring in recirculating aquaculture systems - ResearchGate, accessed July 21, 2025,
(PDF) Water quality monitoring in recirculating aquaculture systems - ResearchGate, accessed July 21, 2025,
Contextual Support Journal

Effect of different total suspended solids levels on a Litopenaeus vannamei (Boone, 1931) BFT culture system during biofloc formation | Request PDF - ResearchGate, accessed July 21, 2025,

View Source
Preview of An Aquaculture Industry for Queensland, accessed July 21, 2025
An Aquaculture Industry for Queensland, accessed July 21, 2025
Regulatory Framework Journal

NSW Marine Waters Sustainable Aquaculture Strategy, accessed July 21, 2025,

View Source
Preview of Australian and New Zealand guidelines for fresh and marine water quality, accessed July 19, 2025,
Australian and New Zealand guidelines for fresh and marine water quality, accessed July 19, 2025,
Regulatory Framework Government

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 21, 2025,

View Source
Preview of Australian prawn farming manual Part 4-9.pdf
Australian prawn farming manual Part 4-9.pdf
Contextual Support

Effects of suspended solids in shrimp biofloc systems - Responsible Seafood Advocate, accessed July 21, 2025,

View Source
Preview of Barramundi - NSW Department of Primary Industries, accessed July 21, 2025,
Barramundi - NSW Department of Primary Industries, accessed July 21, 2025,
Contextual Support GreyLiterature

Barramundi - NSW Department of Primary Industries, accessed July 21, 2025,

View Source
Preview of Barramundi - NSW Department of Primary Industries, accessed July 25, 2025,
Barramundi - NSW Department of Primary Industries, accessed July 25, 2025,
Contextual Support Government

Polygenic discrimination of migratory phenotypes in an estuarine, accessed July 21, 2025,

View Source
Preview of Barramundi culture in Australia - Responsible Seafood Advocate
Barramundi culture in Australia - Responsible Seafood Advocate
Contextual Support GreyLiterature

Environmental Impacts of Shrimp Aquaculture and Integrated Multi-trophic Aquaculture (IMTA) as a Solution - UMass Amherst, accessed July 21, 2025,

View Source
Preview of Biofloc Technology: A Simple, Green Way to Farm Fish and Shrimp, accessed July 21, 2025,
Biofloc Technology: A Simple, Green Way to Farm Fish and Shrimp, accessed July 21, 2025,
Contextual Support Journal

Biofloc Technology: A Simple, Green Way to Farm Fish and Shrimp, accessed July 21, 2025,

View Source
Preview of CSIRO Research Publications Repository - Home Page, accessed August 4, 2025,
CSIRO Research Publications Repository - Home Page, accessed August 4, 2025,
Contextual Support Government

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed July 21, 2025,

View Source
Preview of Daintree and Mossman River Basins Environmental Values and Water Quality Objectives - Queensland Environment Department, accessed July 21, 2025,
Daintree and Mossman River Basins Environmental Values and Water Quality Objectives - Queensland Environment Department, accessed July 21, 2025,
Regulatory Framework Journal

Daintree and Mossman River Basins Environmental Values and Water Quality Objectives - Queensland Environment Department, accessed July 21, 2025,

View Source
Preview of Daintree catchment water quality targets, accessed July 21, 2025,
Daintree catchment water quality targets, accessed July 21, 2025,
Regulatory Framework Journal

Daintree catchment water quality targets, accessed July 21, 2025,

View Source
Preview of FAO-Lates calcarifer Bloch - Food and Agriculture Organization of the United Nations, accessed July 21, 2025,
FAO-Lates calcarifer Bloch - Food and Agriculture Organization of the United Nations, accessed July 21, 2025,
Contextual Support GreyLiterature

FAO-Lates calcarifer Bloch - Food and Agriculture Organization of the United Nations, accessed July 21, 2025,

View Source
Preview of HOW TURBIDITY AFFECTS FISH BEHAVIOUR - Active Angling New Zealand, accessed July 21, 2025,
HOW TURBIDITY AFFECTS FISH BEHAVIOUR - Active Angling New Zealand, accessed July 21, 2025,
Contextual Support Government

HOW TURBIDITY AFFECTS FISH BEHAVIOUR - Active Angling New Zealand, accessed July 21, 2025,

View Source
Preview of Improving Water Quality in the Wet Tropics, Australia: A Conceptual Framework and Case Study - MDPI, accessed July 18, 2025,
Improving Water Quality in the Wet Tropics, Australia: A Conceptual Framework and Case Study - MDPI, accessed July 18, 2025,
Contextual Support Journal

NSW Land Based Sustainable Aquaculture Strategy, accessed July 21, 2025,

View Source
Preview of Management - WaterNSW, accessed July 21, 2025,
Management - WaterNSW, accessed July 21, 2025,
Contextual Support Government

Management - WaterNSW, accessed July 21, 2025,

View Source
Preview of Marine Monitoring Program - Inshore water quality monitoring (AIMS ..., accessed August 3, 2025,
Marine Monitoring Program - Inshore water quality monitoring (AIMS ..., accessed August 3, 2025,
Contextual Support Government

Marine Monitoring Program - Inshore water quality monitoring (AIMS) - eAtlas, accessed July 21, 2025,

View Source
Preview of Modeling Environmental Impacts of Intensive Shrimp Aquaculture: A Three-Dimensional Hydrodynamic Ecosystem Approach - MDPI, accessed July 21, 2025,
Modeling Environmental Impacts of Intensive Shrimp Aquaculture: A Three-Dimensional Hydrodynamic Ecosystem Approach - MDPI, accessed July 21, 2025,
Contextual Support Journal

Modeling Environmental Impacts of Intensive Shrimp Aquaculture: A Three-Dimensional Hydrodynamic Ecosystem Approach - MDPI, accessed July 21, 2025,

View Source
Preview of Monitoring water quality | AIMS - The Australian Institute of Marine Science, accessed August 3, 2025,
Monitoring water quality | AIMS - The Australian Institute of Marine Science, accessed August 3, 2025,
Contextual Support GreyLiterature

Monitoring water quality | AIMS - The Australian Institute of Marine Science, accessed July 21, 2025,

View Source
Preview of NSW Marine Waters Sustainable Aquaculture Strategy
NSW Marine Waters Sustainable Aquaculture Strategy
Regulatory Framework Journal

Queensland Aquaculture Strategy 2024–2034, accessed July 21, 2025,

View Source
Preview of OPTIMUM CONDITION OF WATER FOR AQUACULTURE | Agriallis, accessed July 21, 2025,
OPTIMUM CONDITION OF WATER FOR AQUACULTURE | Agriallis, accessed July 21, 2025,
Contextual Support Journal

OPTIMUM CONDITION OF WATER FOR AQUACULTURE | Agriallis, accessed July 21, 2025,

View Source
Preview of Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,
Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,
Contextual Support Journal

Australian prawn farming manual Part 4-9.pdf, accessed July 21, 2025,

View Source
Preview of Water quality | AIMS - The Australian Institute of Marine Science, accessed July 21, 2025,
Water quality | AIMS - The Australian Institute of Marine Science, accessed July 21, 2025,
Contextual Support Government

Water quality | AIMS - The Australian Institute of Marine Science, accessed July 21, 2025,

View Source
Preview of Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Regulatory Framework Government

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000)

View Source
Preview of Water Quality Improvement Plan Douglas Shire Far North Queensland, accessed July 21, 2025,
Water Quality Improvement Plan Douglas Shire Far North Queensland, accessed July 21, 2025,
Contextual Support Journal

Context dependency of top-down and bottom-up effects in a Northern Australian tropical river | Freshwater Science: Vol 34, No 2 - The University of Chicago Press: Journals, accessed July 21, 2025,

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Rainforests
  • Land Use Aquaculture
  • Assessment Conservation Target
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 19 Mar 2026

Notes

The benchmark aligns with the natural clear-water state of the biome while allowing for managed biological productivity. Chronic turbidity > 36 NTU is associated with negative ecosystem impacts.

Related Benchmarks

Other benchmarks in the AUS-TSR-AQU-WTU family.

50 NTU Moderate
Aquaculture · Pristine Reference
MaximumOnly Active v2
— NTU High
Aquaculture · Pristine Reference
OptimalRange Retired v1
36 NTU Moderate
Aquaculture · Pristine Reference
MinimumOnly Superseded v1