Read ammonia, nitrite and nitrate correctly: 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: TAN, NH3, ammonium, nitrogen reporting bases, nitrite, nitrate and event records.
Read the practical guide
Download this guide's 8 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
- 8
- Direct Neocaridina
- 2
- Direct controlled experiments
- 1
- Supporting authorities
- 7
- Named open questions
- 2
- Public research changes
- 1
Registry reviewed 2026-08-12. Next scheduled review 2027-02-12. Read the editorial method.
Review or synthesis
Broader ornamental-shrimp review
Holroyd et al., 2026. Conservation Physiology 14(1): coag046.
Source taxon as published: Tropical ornamental shrimp, including Neocaridina literature
Study shape: Published physiology, trade and transport evidence was synthesized and major gaps were identified.
Experimental unit: Published source, not a new animal experiment
Environment: Review of aquarium trade and transport evidence
Endpoints: temperature evidence, oxygen evidence, carbonate chemistry, nitrogen waste, health assessment.
What it can support: The review maps major species-specific evidence gaps and relevant transport stressors.
What it cannot support: It does not validate a drip rate, package, forecast gate, water target or treatment for Neocaridina.
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System observation or method study
Adjacent aquarium-system evidence
McKnight et al., 2025. ISME Communications 5(1): ycaf212.
Source taxon as published: Home aquarium biofilter microorganisms, not a Neocaridina animal experiment
Study shape: Weekly bead, sponge and water samples were paired with chemistry, qPCR and community sequencing while stocking and maintenance varied by home.
Experimental unit: Home aquarium, n equals three; repeated samples and technical replicates remain nested within aquarium
Environment: Three independently established home freshwater aquaria followed for twelve weeks
Endpoints: total ammonia, nitrite, nitrate, amoA abundance, microbial community succession.
What it can support: Nitrification timing and nitrifier succession differed among the three aquaria, with comammox Nitrospira prominent later in every sampled biofilter.
What it cannot support: Three uncontrolled home systems do not establish a universal three-week or eight-week cycle, a product effect or commissioned animal capacity.
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Controlled experiment
Direct Neocaridina evidence
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
Scagnelli et al., 2023. Journal of Exotic Pet Medicine 44: 22-26.
Source taxon as published: Fishless freshwater aquarium systems, not a Neocaridina animal experiment
Study shape: Five aquaria each received a different commercial quick-start product and one aquarium was untreated after a 1.0 ppm ammonium-hydroxide addition.
Experimental unit: Aquarium, with one aquarium per product and one untreated control
Environment: Six ten-gallon freshwater aquaria followed for fourteen days
Endpoints: total ammonia nitrogen, nitrite, nitrate.
What it can support: Only one of five tested products produced lower total ammonia nitrogen than the control during this fourteen-day design.
What it cannot support: One aquarium per product provides no independent treatment replication and cannot certify or rank current products, prove instant cycling or establish animal-ready capacity.
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System observation or method study
Direct Neocaridina evidence
Mahmoud, Sastranegara and Kusmintarsih, 2020. Biodiversitas 21(6): 2396-2402.
Source taxon as published: Market-sourced animals labelled Neocaridina denticulata and Neocaridina palmata; identification method not reported
Study shape: Thirty market-sourced animals per labelled species, 15 male and 15 female, first shared one aquarium per species. Fifteen ovigerous females per species were later described as moving to individual aquaria for egg and hatch observations, after which healthy offspring were reared and measured through a reported maturity sequence. Only descriptive statistics were stated.
Experimental unit: One initial aquarium per labelled species, so species and tank were confounded; the number, size and independence of the later female and offspring aquaria were not reported, and individual offspring tracking was not described
Environment: One 30-litre aquarium per labelled species with powerhead filtration, aeration, white stone, Java moss, twice-daily 40 percent protein pellets, partial water renewal every three weeks and naturally varying 25 to 28 C water
Endpoints: adult and post-hatching total length, egg length and width, attached egg count per female, reported time to life-stage labels, temperature, pH, dissolved oxygen, nitrate, ammonia.
What it can support: Under the reported culture history, the market-sourced groups produced attached eggs and direct-developing shrimp-like young. Fifteen females under each label supplied reported egg-count ranges of 21 to 60 for N. denticulata and 21 to 58 for N. palmata, and photographed post-hatching young measured about 3.3 mm at 24 hours.
What it cannot support: Species identity rested on market sourcing, colour and photographs without a diagnostic key or molecular confirmation. With one initial aquarium per label, species and tank were confounded, preventing an independent species comparison. Female isolation, offspring allocation, starting hatch denominators, survival, losses and repeated-animal tracking were not reported. The stated June 14 to August 10 breeding interval does not reconcile with 75-day and 80-day observations. Tables place ranges in columns labelled Means while also giving separate standard deviations, figures and axes are inconsistently numbered or labelled, and no inferential model is reported. Temperature and pH varied within the same systems rather than being assigned, so plots cannot establish 27 C as an optimum or any pH effect. The water methods, analyte bases and nitrogen interpretation are incomplete, and nitrite named in the abstract is not reported in the tables. Calling the direct-developing young larvae and describing a planktonic phase conflict with the better-resolved N. davidi developmental literature. The source cannot establish a universal 15-day incubation, 75-day maturity calendar, water-quality threshold, species difference or cultivation optimum.
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Controlled experiment
Adjacent aquarium-system evidence
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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System observation or method study
Adjacent aquarium-system evidence
Sauder et al., 2011. PLOS ONE 6(8): e23281.
Source taxon as published: Freshwater aquarium biofilter microorganisms, not a Neocaridina animal experiment
Study shape: qPCR, gene sequencing and water chemistry were compared across sampled freshwater biofilters, with saltwater filters and two supplements as context.
Experimental unit: Sampled aquarium biofilter; technical molecular replicates are not independent aquaria
Environment: Twenty-seven residential and retail freshwater aquarium biofilters in Ontario
Endpoints: amoA gene abundance, community fingerprints, ammonium, nitrite, nitrate.
What it can support: Thaumarchaeal ammonia-oxidizer genes dominated the detectable amoA signal in most sampled freshwater biofilters.
What it cannot support: Gene abundance does not measure complete nitrogen-processing capacity, prove a filter mature or prescribe a product, media volume or cycle duration.
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Controlled experiment
Adjacent aquarium-system evidence
Hovanec et al., 1998. Applied and Environmental Microbiology 64(1): 258-264.
Source taxon as published: Freshwater aquarium nitrifying communities, not a Neocaridina animal experiment
Study shape: Molecular probes, clone libraries and water chemistry followed nitrite oxidizers during aquarium establishment and an additive comparison.
Experimental unit: Aquarium for treatment and chemistry; sampled gravel or biofilter material for molecular endpoints
Environment: Ammonium-dosed freshwater aquaria and aquarium biofilter samples
Endpoints: ammonia, nitrite, nitrate, rRNA sequence and probe signal.
What it can support: Nitrospira-like organisms appeared with nitrite oxidation in the tested freshwater aquarium systems.
What it cannot support: One establishment design does not establish a universal cycle day, prove an additive effective or certify animal-ready capacity.
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