Water Turbidity

AUS-AKW-AQU-WTU General Moderate confidence

Benchmark Value

15 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

The "upper detrimental threshold" in this context is not the maximum turbidity a fish can physically tolerate before its gills are harmed (which would be very high). Instead, it is the operational trigger point at which a farm manager identifies a system imbalance and takes corrective action.

Metric Definition:

Operational turbidity threshold indicating system degradation in groundwater-fed aquaculture.

Benchmark Definition:

This benchmark marks the turbidity threshold above which system management failure is indicated in groundwater-fed aquaculture in the Arid Karstic Woodlands & Shrublands biome, prompting corrective action to protect fish health.

Justification:

Set deliberately low as an operational trigger to maintain system integrity and water quality.

Sources (1)

Derived Benchmark based on Functional Analogue (MainStream Aquaculture) and National Guidelines (ANZECC/ANZG) Government

Derived Benchmark based on Functional Analogue (MainStream Aquaculture) and National Guidelines (ANZECC/ANZG)

View Source

Supporting Sources (2)

Additional references from the underlying research that informed this benchmark.

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,

Direct Evidence

Using the ANZECC Guidelines and Water Quality Objectives in NSW

View Source

The Impact of Turbidity on Fish Health in Aquaculture Systems

Contextual Support Journal

The Impact of Turbidity on Fish Health in Aquaculture Systems

View Source

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Aquaculture
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 2
Effective From 4 Jun 2026

Notes

A sustained or sharp rise in turbidity above 15 NTU indicates system malfunction and prompts immediate corrective action to protect fish health. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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