How do named fish species affect adult retention and juvenile recruitment?

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

Predator-cue behaviour and shelter studies did not place fish with shrimp and follow colony outcomes.

What would answer it

Replicated shrimp-only and named-fish comparisons with adult, hatchling and juvenile denominators over multiple broods.

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 named fish and habitat combination retains adults and recruits juveniles across repeated broods.

Primary endpoint: Adult retention and juvenile recruitment through multiple broods, with injury and welfare outcomes reported.

Minimum design: Replicated shrimp-only and named-fish treatments with standardized habitat, initial animals, feeding and observation, plus prespecified humane stopping rules.

Required reporting: Fish species, size, number and source, shrimp source and life stages, tank allocation, shelter and plants, feed, complete adult, egg, hatchling and juvenile denominators, removals, injuries, deaths, missing animals and stopping events.

Community can contribute: Standardized coexistence observations can identify candidate species, hiding contexts and adverse events for controlled study design.

Community observations cannot establish: Seeing adults coexist does not measure hatchling predation, recruitment, welfare or a universally safe tankmate.

Closure rule: A bounded answer applies only to the named fish, size, density and habitat tested and must include both adult and juvenile outcomes.

Open this question in the complete answerable research agenda.

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: Adult coexistence is easy to observe but does not measure hatchling predation, recruitment or welfare across repeated broods.

Next permitted unit: Develop humane stopping rules and a replicated shrimp-only versus one named fish and habitat comparison for independent welfare review.

Activation trigger: A qualified partner can provide replicated systems, complete life-stage counts and prospective adverse-event stopping authority.

Stop decision: Do not solicit uncontrolled fish additions or treat surviving visible adults as evidence of juvenile-safe coexistence.

Open this question in the complete finite research portfolio.

Reviewed: August 12, 2026.

Topics: Behaviour, Breeding, Habitat

Practical guides governed by this gap

Reproducible search trail

Gap retained Reviewed August 12, 2026

Do named fish comparisons measure both adult Neocaridina retention and juvenile recruitment?

Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis.

Concepts: fish tankmate, predation, adult survival, juvenile recruitment, shelter.

Search surfaces: publisher and DOI records, scholarly web indexes, behaviour journal indexes.

Outcome: No named-fish trial with a shrimp-only control and adult plus juvenile colony denominators was located. Coexistence claims remain unvalidated.

Exact queries and candidate decisions

Exact queries

"Neocaridina davidi" fish tankmate survival recruitment experiment
"Neocaridina heteropoda" predator fish juvenile survival aquarium
Neocaridina named fish shrimp-only control recruitment

Candidate sources

Quantitative genetics of shy-bold behaviour and plastic response to novel predator cues in the cherry shrimp Neocaridina davidi: included. Full methods confirm 80 shrimp in repeated five-minute assays and 1,111 in a single-assay pedigree dataset. It uses water from one novel fish species without a fish in the arena and measures short behaviour rather than capture, survival or recruitment.
Shelter preference and variation in the daily activity pattern of the ornamental shrimp Neocaridina davidi: included. Measures shelter choice without fish and cannot establish protection or colony recruitment with a tankmate.

Next scheduled search: February 12, 2027. Also governs: tankmate-recruitment

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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.