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Named evidence gapWhat is the individual hatch-to-death lifespan distribution in home-like aquaria?
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
Field cohort estimates, a reported laboratory maximum and one known-hatch growth series with losses are not complete individual aquarium lifespan distributions.
What would answer it
Known-hatch, individually tracked cohorts across replicated systems with censored removals and confirmed deaths.
Answerability brief
A coordinated community study may answer part of it
A prospective shared protocol across independent systems may answer a bounded field question if allocation, denominators, exclusions and analysis are fixed before outcomes are known.
Decision at stake: What hatch-to-death lifespan distribution keepers can use for colony planning without repeating an anecdotal maximum.
Primary endpoint: Individual time from known hatch to confirmed death, with censoring and removals retained.
Minimum design: Prospective known-hatch cohorts across independent home-like systems with durable individual or family identity, fixed observation schedule and complete cause-neutral survival accounting.
Required reporting: Hatch date and family, identity method, sex when distinguishable, system allocation, temperature and care history, transfers, last-seen and confirmed-death rules, censored animals, all losses and time-to-event uncertainty.
Community can contribute: A shared long-term protocol across independent colonies can contribute censored individual histories if identity and loss rules are fixed before outcomes.
Community observations cannot establish: The oldest visible shrimp, purchase-to-death interval or disappearance from a colony cannot establish a hatch-to-death distribution.
Closure rule: Report a distribution with censoring and uncertainty, never one lifespan number; source and system replication limit transfer.
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Current research allocation
Design before asking people to participate
Method, units, exclusions, welfare boundaries and analysis must be frozen before inviting participation or viewing outcomes.
Why this allocation: A known-hatch cohort can answer a persistent beginner question, but purchase-age anecdotes and oldest-visible-animal reports cannot estimate a lifespan distribution.
Next permitted unit: Draft a known-hatch, censoring-aware cohort protocol with durable identity, confirmed-death rules, transfer records and a fixed observation schedule.
Activation trigger: Multiple independent keepers can begin known-hatch cohorts under the same identity, loss and censoring rules and commit to long-term follow-up.
Stop decision: Do not open enrollment until loss, removal and last-seen rules are operational; stop adding cohorts if follow-up completeness cannot support time-to-event analysis.
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Reviewed: August 12, 2026.
Topics: Growth and lifespan, Health
Practical guides governed by this gap
Reproducible search trail
Has a replicated known-hatch Neocaridina cohort been followed through individual deaths in home-like aquaria?
Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis.
Concepts: lifespan, longevity, known hatch, individual survival, cohort.
Search surfaces: publisher and DOI records, scholarly web indexes, full-text repositories.
Outcome: The review now includes an open known-age-cohort thesis that rules out two simple molecular age markers under its protocols. It does not supply a lifespan distribution because no animal was followed to death and the approximate 13-month value was cited from another source. The lifespan gap remains open.
Exact queries and candidate decisions
Exact queries
"Neocaridina davidi" individual lifespan laboratory hatch death"Neocaridina heteropoda" longevity lifespan aquarium studyNeocaridina known-hatch cohort survival lifespan"Neocaridina heteropoda" sexual maturity age aquarium"Neocaridina denticulata" life cycle aquarium 75 days
Candidate sources
- Life-history traits and ecological characteristics of the ornamental shrimp Neocaridina denticulata, recently introduced into the freshwater systems of Israel: included. Tracks 18 known-hatch animals for molt and growth observations, but losses and stopping rules prevent a complete lifespan distribution.
- Life history of an invasive freshwater shrimp Neocaridina davidi in the Tomoe River: included. Infers lifespan from field size-frequency cohorts rather than following identified animals from hatch to death.
- Population dynamics of Neocaridina davidi in the thermally polluted Gillbach stream: included. Provides field estimates and a reported laboratory maximum, not a replicated individual aquarium survival distribution.
- The lifecycle of Neocaridina denticulata and N. palmata in aquariums: included. Reports an aquarium life-stage sequence, but one initial tank per market label, unclear offspring allocation, missing survival denominators and inconsistent tables prevent a universal 75-day maturity calendar or lifespan inference.
- Estimation of the size of sexual maturity in reproducers of Neocaridina heteropoda under laboratory conditions: included. Begins with selected adult broodstock and does not document the F1 hatch or age-assignment method needed to validate its reported maturity weeks.
- Ageing the unageable: investigating novel methods of ageing crustaceans: included. Uses bounded-age aquarium cohorts to test two molecular markers, but it is cross-sectional, samples one selected cohort tank per age group, follows no individual to death and cites rather than measures the approximate 13-month lifespan used to describe sampling coverage.
Next scheduled search: February 12, 2027. Also governs: aquarium-lifespan
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.