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Named evidence gapDoes a particular filter type or turnover rate improve Neocaridina outcomes?
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 field survey associated lower current velocity with higher juvenile density, but no assigned aquarium comparison supports a universal turnovers-per-hour rule or one required filter design.
What would answer it
Replicated complete-system comparisons holding biomass, feed, media maturity and intake retention constant.
Answerability brief
Dedicated controlled research is required
The question requires assigned treatments, independently replicated systems, controlled comparisons and measured exposures or conditions.
Decision at stake: Whether a filter design or measured flow improves animal outcomes instead of merely moving more water.
Primary endpoint: Juvenile retention and whole-colony survival, with nitrogen processing, oxygen and intake injury recorded as mechanisms rather than substitutes.
Minimum design: Replicated complete-system comparisons that vary one filter or verified flow condition while holding mature media, biomass, feeding, habitat and maintenance constant.
Required reporting: Measured in-tank and outlet flow, media and maturity, intake protection, oxygen, nitrogen processing, biomass, feeding, maintenance interventions, independent tanks, life-stage denominators and losses.
Community can contribute: Keepers can document actual measured flow, filter configuration, intake protection and observed failures to improve treatment selection.
Community observations cannot establish: Manufacturer flow ratings and successful individual tanks cannot isolate filter type or create a turnovers-per-hour rule.
Closure rule: Only replicated animal-outcome comparisons with verified hydraulic conditions can support a bounded filter claim.
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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: Manufacturer ratings and successful single tanks do not isolate filtration, flow, intake protection or mature-media effects.
Next permitted unit: Specify a complete-system comparison that varies one verified hydraulic condition while preserving mature media, biomass, habitat and maintenance.
Activation trigger: A collaborator can supply replicated mature systems, in-tank flow measurement and complete juvenile and adult denominators.
Stop decision: Do not collect additional equipment-name polls or convert flow ratings into biological turnover recommendations.
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Reviewed: August 12, 2026.
Topics: Filtration, Nitrogen waste, Growth and lifespan
Practical guides governed by this gap
Reproducible search trail
Does an assigned aquarium comparison establish a Neocaridina filter type, flow rate or turnover rule?
Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis.
Concepts: filter type, turnover rate, flow rate, current velocity, juvenile density.
Search surfaces: publisher and DOI records, scholarly web indexes, full-text repositories.
Outcome: The gap is refined with a quantified field association. No assigned aquarium filter or turnover comparison was located, so no universal hardware or flow rule follows.
Exact queries and candidate decisions
Exact queries
Neocaridina davidi filter flow rate experiment aquarium"Neocaridina heteropoda" filter turnover flow experiment"Neocaridina denticulata sinensis" current velocity aquarium
Candidate sources
- The distribution of the invasive shrimp Neocaridina davidi in relation to environmental parameters in a stream at Kunitachi, Tokyo, Japan: included. Quantifies a field association between current velocity and juvenile density, but does not assign aquarium flow.
- Assessment of a biofilm-based culture system within zero water exchange on water quality and shrimp survival and growth: included. Documents a designed aerated biofilm system but does not compare filter types or turnover rates.
Next scheduled search: February 12, 2027. Also governs: filter-turnover
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.