Water Turbidity

AUS-AKW-AQU-WTU General Moderate confidence

Benchmark Value

No specific value — see range

Range: 5 to 15 NTU

Thresholds: Lower: 5, Upper: 15

Optimal Range: 5 to 15

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 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 optimal state for such a system is the active management of turbidity within a narrow, stable range that avoids both the stress of hyper-clarity and the system degradation indicated by higher turbidity.

Metric Definition:

Functional operational range of water turbidity in groundwater-fed aquaculture systems.

Benchmark Definition:

This benchmark defines the optimal turbidity range for a healthy, stable, and productive groundwater-fed aquaculture system in the Arid Karstic Woodlands & Shrublands biome, balancing fish welfare and operational control.

Justification:

Based on evidence of physiological stress at very low turbidity and operational triggers at higher turbidity, defining a managed optimal range.

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 HealthyOperationalRange

Lifecycle

Status Active
Version 1
Effective From 4 Jun 2026

Notes

The optimal operational range avoids the negative welfare impacts of hyper-clear water and stays well below levels indicating system malfunction. It reflects active management for fish health and growth. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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