Improve measurement quality: evidence dossier

This is the audit trail behind one practical guide. It keeps the linked studies, supporting authorities, named uncertainty, search trail and public changes together without copying a second bibliography.

Guide purpose: Test kits, strips, meters, calibration, resolution, reporting steps and repeatable records.

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Download this guide's 3 linked evidence records: CSL-JSON or RIS. Both retain every record's support and limitation notes.

This is an inventory, not a confidence score. A direct study is still limited by its animals, experimental unit, water, treatment, duration and endpoint. Record counts do not prove consensus, completeness or a universal care rule.

Linked evidence records: 3
Direct Neocaridina: 2
Direct controlled experiments: 2
Supporting authorities: 12
Named open questions: 1
Public research changes: 0

Registry reviewed 2026-08-12. Next scheduled review 2027-02-12. Read the editorial method.

Linked evidence records

Each record states what was measured and the nearest claim it cannot support. One source can serve several guides, so dossier totals must not be added together.

Controlled experiment Direct Neocaridina evidence

Differences in solubility behaviour and acute toxicity of ionic silver and silver nanoparticles towards Neocaridina davidi

Hugger, 2025. Master thesis, University of Vienna.
Source taxon as published: Neocaridina davidi

Study shape: Ionic silver, PVP-coated nanospheres and uncoated nanopowder were compared with measured dissolved silver and animal accumulation.

Experimental unit: Mesocosm exposure unit, not each shrimp sharing the exposure

Environment: Mesocosm exposures in artificial Danube water

Endpoints: 24-hour mortality, median lethal estimate, dissolved silver, whole-animal accumulation.

What it can support: The three tested silver forms had different dissolution and acute mortality relationships under the mesocosm chemistry.

What it cannot support: A master thesis acute result is not a chronic safe value, copper proxy, product limit or household aquarium target.

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Controlled experiment Direct Neocaridina evidence

Efeito de compostos nitrogenados no camarão Neocaridina davidi e na rã Aquarana catesbeiana

Melo, 2023. Doctoral thesis, Federal University of Minas Gerais.
Source taxon as published: Neocaridina davidi

Study shape: Separate total-ammonia and nitrite experiments used a control plus five treatments, two vessels per treatment and ten juveniles per vessel.

Experimental unit: Exposure vessel, not each shrimp

Environment: Renewed 96-hour acute laboratory exposures at about 25 C

Endpoints: 96-hour mortality, median lethal estimates, gill histology.

What it can support: Direct acute juvenile ammonia and nitrite exposure-response estimates with stated nitrogen reporting bases.

What it cannot support: A doctoral thesis with limited treatment replication does not provide chronic nitrate, chronic no-effect levels, transport limits or home targets.

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Controlled experiment Adjacent aquarium-system evidence

Assessing the Reliability of Water-Test Kits for Use in Pond Aquaculture

Naigaga et al., 2017. Journal of the World Aquaculture Society 48(4): 555-562.
Source taxon as published: Pond-aquaculture water samples and analytical methods, not shrimp

Study shape: Several field kits and strips were compared with standard methods by the management decisions each result would produce.

Experimental unit: Water sample and paired analytical-method comparison

Environment: Pond-aquaculture water analysis compared with standard methods

Endpoints: decision agreement, weighted kappa, analyte-specific disagreement.

What it can support: Reliability differed by kit and analyte, including nitrate decision disagreement for two tested strip products.

What it cannot support: The study does not validate every current product, make all strips inadequate or show that a kit result equals a laboratory concentration without method context.

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Supporting authorities

These can govern a method, professional boundary, regulation, maintained identity record or manufacturer instruction. They are not counted as animal evidence.

Source and role	Supports	Limit
General Information and Guidelines for Field-Measured Water-Quality Properties U.S. Geological Survey; Analytical method or chemistry authority	Calibration, quality assurance, field records and method-context principles for measured water properties.	A professional field manual does not validate a specific hobby kit or establish a Neocaridina water target. Open the authoritative source.
Specific Conductance U.S. Geological Survey; Analytical method or chemistry authority	Professional measurement, calibration and reporting context for specific conductance.	It does not turn conductivity or a converted TDS value into ionic composition or a shrimp-health verdict. Open the authoritative source.
Measurement of pH U.S. Geological Survey; Analytical method or chemistry authority	Professional pH calibration, sampling and reporting context.	It does not validate every aquarium meter, reconstruct an old sample or define a species optimum. Open the authoritative source.
Effluent Monitoring Procedures: Nutrients U.S. Environmental Protection Agency; Analytical method or chemistry authority	Formula-mass conversions between nitrogen-basis and whole-ion nitrite and nitrate reporting.	A conversion preserves chemical amount; it does not create a Neocaridina toxicity threshold. Open the authoritative source.
Definition and Procedure for the Determination of the Method Detection Limit, Revision 2 U.S. Environmental Protection Agency; Analytical method or chemistry authority	The defined scope and calculation of an EPA method detection limit.	The procedure does not automatically apply to a hobby comparator, strip or unvalidated digital meter. Open the authoritative source.
CADDIS: Ammonia U.S. Environmental Protection Agency; Analytical method or chemistry authority	Environmental ammonia measurement, speciation and pH-and-temperature context.	General environmental guidance does not establish a Neocaridina chronic limit or aquarium diagnosis. Open the authoritative source.
CADDIS: Nutrients U.S. Environmental Protection Agency; Analytical method or chemistry authority	Nitrogen-analyte, reporting-basis and analytical-method distinctions.	It does not make unlike analytes interchangeable or set a home-aquarium action point. Open the authoritative source.
Copper Biotic Ligand Model U.S. Environmental Protection Agency; Analytical method or chemistry authority	Water-chemistry inputs that alter modeled copper bioavailability.	The model does not turn one total-copper reading into a Neocaridina effect or validate a home treatment. Open the authoritative source.
Chemical Metrology National Institute of Standards and Technology; Analytical method or chemistry authority	Measurement validation, matrix, traceability and uncertainty principles.	General metrology principles do not validate a specific aquarium result or assign biological meaning. Open the authoritative source.
Conductivity meter manual National Institute of Standards and Technology; Analytical method or chemistry authority	Conductivity measurement, temperature compensation and TDS-conversion-factor context for the named instrument.	A conversion factor does not reveal dissolved composition, hardness or a Neocaridina optimum. Open the authoritative source.
Alkalinity and Water U.S. Geological Survey; Analytical method or chemistry authority	General acid-neutralizing-capacity and buffering context.	Alkalinity is not a direct pH control, carbonate inventory or species optimum without method and water context. Open the authoritative source.
Hardness of Water U.S. Geological Survey; Analytical method or chemistry authority	The definition and conventional reporting of calcium-and-magnesium water hardness.	Hardness does not reveal every ion, diagnose a molt or establish a Neocaridina optimum. Open the authoritative source.

Named open questions and searches

What GH, KH, pH and conductivity combinations are true biological optima?

Current boundary: Field occurrences and study culture water describe places or reproducible conditions, not species-wide GH, KH, pH or conductivity optima.

What would answer it: Factorial, replicated exposures across lines and life stages with measured ions and long-term biological endpoints.

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Reproducible search reviews

Do direct experiments establish combined GH, KH, pH and conductivity optima for Neocaridina?: The occurrence boundary is broader, but no replicated factorial water-parameter optimum study was located. Field ranges and culture values remain contexts rather than targets. Reviewed 2026-08-12; next review 2027-02-12.

Public research changes affecting this guide

No public research-change entry currently names this guide. The current evidence records and review date still apply.

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