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Named evidence gapWhat determines a stable operating capacity in a multigeneration home aquarium?
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 90-day juvenile density study, field density and an unreplicated three-generation observation cannot be multiplied into a planted-tank maximum.
What would answer it
Long, replicated complete-system studies with life-stage counts, feed, recruitment, growth, maintenance, nitrogen processing and welfare endpoints.
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: Which measured system outcomes define an operating intervention point instead of a shrimp-per-gallon maximum.
Primary endpoint: Multigeneration recruitment, survival and welfare together with resource and waste-processing performance.
Minimum design: Long independently replicated complete systems assigned to density or resource treatments with standardized starting cohorts, habitat, feed, mature filtration and maintenance rules.
Required reporting: Tank volume and usable habitat, initial and repeated life-stage counts, feed and grazing inputs, oxygen, nitrogen processing, maintenance interventions, removals, reproduction, growth, deaths, density changes, allocation and system-level uncertainty.
Community can contribute: Repeated fixed-method life-stage counts and intervention records can improve realistic density trajectories and operational endpoints.
Community observations cannot establish: One stable-looking tank or current head count cannot reveal capacity, hidden mortality, recruitment or the resource that will fail first.
Closure rule: The result must be an operating envelope for the tested system and outcomes, not a universal maximum multiplied from volume.
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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: Short juvenile density studies and single established colonies cannot estimate multigeneration complete-system capacity.
Next permitted unit: Specify a long complete-system design with life-stage counts, feed, recruitment, maintenance, nitrogen processing and prespecified welfare endpoints.
Activation trigger: A long-term collaborator can maintain replicated systems and preserve complete intervention, removal, recruitment and loss records.
Stop decision: Stop adding shrimp-per-volume rules, snapshots or unreplicated colony maxima that omit resources, age structure and maintenance history.
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Reviewed: August 12, 2026.
Topics: Stocking and density, Growth and lifespan, Nitrogen waste, Breeding
Practical guides governed by this gap
Reproducible search trail
Do multigeneration complete-system experiments establish stable home-aquarium carrying capacity?
Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis.
Concepts: carrying capacity, population growth, density, multigeneration, recruitment.
Search surfaces: publisher and DOI records, scholarly web indexes, full-text repositories.
Outcome: The evidence base now distinguishes short grow-out density, field density and unreplicated multigeneration observation. No complete-system carrying-capacity experiment was located.
Exact queries and candidate decisions
Exact queries
"Neocaridina davidi" carrying capacity multigeneration aquarium population experiment"Neocaridina davidi" population growth density long term cultureNeocaridina complete-system capacity recruitment density
Candidate sources
- Density and gender segregation effects in the culture of the caridean ornamental red cherry shrimp Neocaridina davidi Bouvier, 1904 (Caridea: Atyidae): included. A 90-day juvenile density comparison measures growth and survival, not multigeneration complete-system capacity.
- The distribution of the invasive shrimp Neocaridina davidi in relation to environmental parameters in a stream at Kunitachi, Tokyo, Japan: included. Reports field density and habitat associations, which cannot define capacity in a maintained home aquarium.
- Life-history traits and ecological characteristics of the ornamental shrimp Neocaridina denticulata, recently introduced into the freshwater systems of Israel: included. Observes three laboratory generations without a replicated density or resource treatment and therefore does not test capacity.
Next scheduled search: February 12, 2027. Also governs: carrying-capacity
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.