Water Turbidity

AUS-TSR-AQU-WTU General Moderate confidence

Benchmark Value

5 NTU

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 15 benchmarks together — the OptimalRange form drives the primary score, while 14 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard OptimalRange Guard Point Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard Point Guard LowerThreshold Guard OptimalRange Guard 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 the median ambient water quality in aquaculture systems.

Benchmark Definition:

Median ambient water turbidity target representing best available condition in sustainable aquaculture.

Justification:

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, allowing 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.

Preview of Barramundi culture in Australia - Responsible Seafood Advocate

Barramundi culture in Australia - Responsible Seafood Advocate GreyLiterature

Barramundi culture in Australia - Responsible Seafood Advocate

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.

Supporting Sources (24)

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,

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,

Preview of An Aquaculture Industry for Queensland, accessed July 21, 2025

An Aquaculture Industry for Queensland, accessed July 21, 2025

Regulatory Framework Journal

NSW Land Based Sustainable Aquaculture Strategy

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

Australian Alps Liaison Committee (AALC). (2011). Caring for our Australian Alps catchments: A climate change action strategy. Department of Climate Change and Energy Efficiency.

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,

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,

Preview of Barramundi - NSW Department of Primary Industries, accessed July 25, 2025,

Barramundi - NSW Department of Primary Industries, accessed July 25, 2025,

Contextual Support GreyLiterature

Real time monitoring of water quality and mechanisation of pond management to boost productivity and increase profit in Barramundi (Lates calcarifer), accessed July 24, 2025,

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,

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

The state of play on Norfolk Island's reef, accessed July 27, 2025

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

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,

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,

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,

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,

Preview of Management - WaterNSW, accessed July 21, 2025,

Management - WaterNSW, accessed July 21, 2025,

Contextual Support Government

Management - WaterNSW, accessed July 21, 2025,

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

Great Barrier Reef Marine Monitoring Program for Inshore Water Quality - Chlorophyll Fluorescence and Turbidity Time-series Data, accessed August 3, 2025

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,

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

Declining water quality - Great Barrier Reef Marine Park Authority, accessed August 3, 2025

Preview of NSW Marine Waters Sustainable Aquaculture Strategy

NSW Marine Waters Sustainable Aquaculture Strategy

Regulatory Framework Journal

National Aquaculture Statement

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,

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

Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU

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,

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)

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,

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Aquaculture
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Superseded
Version 1
Effective From 5 Jun 2026
Effective To 5 Jun 2026

Notes

This benchmark reflects a state of high ecological health, is demonstrably achievable through best-practice management, and sits well below thresholds known to cause physiological or ecosystem-level harm. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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