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Named evidence gapWhat are chronic ammonia and nitrite no-effect ranges for Neocaridina?
A precise unanswered question is part of the source of truth. It prevents an absent study, indirect result or popular rule from becoming false certainty.
This is a current search boundary, not proof that no study exists. The dated searches below show what was checked, which candidates were included or excluded and what evidence would change the answer.
Current boundary
A direct N. davidi thesis provides a 96-hour acute juvenile experiment. An official abstract for a restricted 2007 N. denticulata thesis reports chronic total-ammonia growth and reproductive comparisons, but its complete methods and results are unavailable. Neither source establishes a chronic operating range, and no controlled chronic nitrite study was located.
What would answer it
The complete 2007 thesis methods and results plus independent replicated chronic ammonia and nitrite exposures across life stages with measured chemistry, exact nitrogen basis, confidence intervals and nonlethal endpoints.
Answerability brief
Specialist-led research is required
The question requires specialist identification, analytical verification, welfare oversight or treatment authority beyond an ordinary keeper observation.
Decision at stake: Whether measured ammonia or nitrite exposure can support chronic risk boundaries distinct from acute emergency practice.
Primary endpoint: Survival, growth and reproduction across chronic exposure, with unionized ammonia calculated from measured chemistry where relevant.
Minimum design: Separate replicated ammonia and nitrite treatment series with analytical concentration checks, stable exposure histories, untreated controls, multiple life stages and prospective nonlethal endpoints.
Required reporting: Exact analyte and nitrogen basis, total and unionized ammonia context, concentration verification, pH, temperature, oxygen, chloride and major-ion context, renewal, allocation, vessel and animal denominators, exclusions and uncertainty.
Community can contribute: Keepers can provide method-labelled incident histories and recovery observations that improve emergency questions and realistic exposure selection.
Community observations cannot establish: Accidental events lack controlled dose, duration and comparison and must not be used to derive a safe chronic limit.
Closure rule: Complete reviewable chronic methods and replicated analyte-specific results are required. Abstract values, acute mortality and nominal concentrations do not close the gap.
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Current research allocation
Qualified collaboration required
The current publisher cannot answer this alone. Work waits for suitable facilities, expertise, oversight and independently replicated units.
Why this allocation: Controlled exposure and analyte-specific chemistry require specialist facilities and welfare oversight; accidental events cannot define a safe limit.
Next permitted unit: Seek specialist review of separate ammonia and nitrite designs, reporting basis, analytical verification and rescue boundaries.
Activation trigger: A qualified laboratory or complete direct chronic study becomes available with analyte-specific methods and independently replicated units.
Stop decision: Do not convert incidents, nominal concentrations or acute abstracts into additional threshold research or public safe-number claims.
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Reviewed: August 12, 2026.
Topics: Nitrogen waste, Health
Practical guides governed by this gap
Reproducible search trail
Are there controlled chronic nitrate, ammonia or nitrite exposure studies in Neocaridina?
Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis.
Concepts: nitrate toxicity, ammonia toxicity, nitrite toxicity, chronic exposure.
Search surfaces: publisher and DOI records, PubMed, scholarly web indexes, institutional repositories.
Outcome: A restricted official thesis abstract identifies one chronic total-ammonia comparison in N. denticulata, but unavailable full methods prevent validation of its reported maximum acceptable concentration as a care threshold. No controlled chronic nitrate-only or chronic nitrite experiment was located. Both gaps remain open.
Exact queries and candidate decisions
Exact queries
Neocaridina davidi nitrate toxicity chronic nitrate experiment"Neocaridina heteropoda" nitrate toxicity"Neocaridina denticulata sinensis" nitrate exposuresite:pubmed.ncbi.nlm.nih.gov Neocaridina nitrate ammonia nitrite"Neocaridina denticulata" chronic ammonia growth reproduction thesis"Toxic Effects of Ammonia on the Freshwater Shrimp Neocaridina denticulata"
Candidate sources
- Efeito de compostos nitrogenados no camarao Neocaridina davidi e na ra Aquarana catesbeiana: included. Direct acute 96-hour ammonia and nitrite experiment, but not a chronic exposure study.
- Toxic Effects of Ammonia on the Freshwater Shrimp Neocaridina denticulata: candidate. The official restricted-thesis record has a detailed abstract reporting acute tests and chronic total-ammonia groups with growth and reproductive endpoints, but the complete methods, exposure verification, denominators and statistical results are unavailable.
Next scheduled search: February 12, 2027. Also governs: chronic-nitrate, chronic-ammonia-nitrite
Help close or refine this gap
Submit a stable source or correction. A title, abstract or community consensus does not close the gap until its methods and claim boundary are reviewed.