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Named evidence gapWhich microplastic histories affect individual growth, reproduction and survival in home-like systems?
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
Direct studies now cover a short high-concentration polystyrene activity and metabolism exposure plus a five-month smooth-sphere population exposure. Neither represents varied household particle histories or directly measures fecundity and repeated individual growth.
What would answer it
Replicated aquaria with verified particle concentration, polymer, shape and size; contamination controls; realistic source histories; and direct individual growth, fecundity, egg, hatch and survival 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 a defined particle history changes individual health or reproduction at an environmentally and aquarium-relevant exposure.
Primary endpoint: Individual growth, fecundity, egg outcomes and survival, with ingestion, egestion, metabolism and microbiome results kept as mechanistic endpoints.
Minimum design: Contamination-controlled, independently replicated particle treatments with verified polymer, shape, size and concentration, realistic source histories and suitable particle-free controls.
Required reporting: Polymer authentication, particle dimensions and shape, preparation, background contamination, measured water and food exposure, aggregation, ingestion, renewal, animal source, allocation, vessel and animal denominators, direct biological endpoints and uncertainty.
Community can contribute: Keepers can document plausible household particle sources and handling histories to improve exposure relevance, without attempting uncontrolled dosing.
Community observations cannot establish: Visible debris, product presence or one exposed tank cannot identify polymer dose, causal harm or a safe concentration.
Closure rule: Each result remains specific to the verified particle and exposure history. Mechanistic change alone does not close the individual-outcome 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: Polymer authentication, contamination control and measured particle exposure require analytical facilities; uncontrolled dosing would add risk without interpretable evidence.
Next permitted unit: Ask an analytical ecotoxicology collaborator to review realistic source histories, particle verification, contamination blanks and direct individual endpoints.
Activation trigger: A suitable facility can verify polymer, shape, size and exposure and can run replicated controlled systems with welfare oversight.
Stop decision: Do not invite household dosing or convert visible debris, product presence or mechanistic biomarkers into a safe or harmful concentration.
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Reviewed: August 12, 2026.
Topics: Chemical exposure, Health, Growth and lifespan, Breeding
Practical guides governed by this gap
Reproducible search trail
Which direct Neocaridina microplastic studies measure individual growth, reproduction or survival under home-like histories?
Taxon names: Neocaridina davidi, Neocaridina heteropoda, Neocaridina denticulata sinensis, Neocaridina palmata.
Concepts: microplastics, polystyrene, growth, reproduction, survival, behaviour, metabolism.
Search surfaces: publisher and DOI records, PubMed, scholarly web indexes, full-text repositories.
Outcome: A third fully reviewed direct study adds particle-ingestion and short egestion observations in N. palmata without measuring chronic harm. The 2025 combined cadmium study remains a candidate until its methods can be verified, and the home-like growth and fecundity gap remains open.
Exact queries and candidate decisions
Exact queries
"Neocaridina davidi" microplastic exposure reproduction growth 2025 2026"Neocaridina denticulata sinensis" microplastics experiment"Neocaridina" polystyrene microplastics cadmium survival growth histopathologysite:pubmed.ncbi.nlm.nih.gov Neocaridina microplastic
Candidate sources
- Microplastics Affecting Population Growth, Mortality and Life Stages of Cherry Shrimp, Neocaridina davidi: included. Direct five-month aquarium exposure with mortality and size-class counts, but no repeated individual growth or fecundity endpoints.
- Polystyrene Microparticles and the Functional Traits of Invertebrates: A Case Study on Freshwater Shrimp Neocardina heteropoda: included. Direct 7-day and 14-day activity and metabolism comparison, with an aquarium-level assignment caveat in the published analysis.
- Particle shape does not affect ingestion and egestion of microplastics by the freshwater shrimp Neocaridina palmata: included. Direct 24-hour particle-recovery and four-hour egestion observations in N. palmata, but no chronic health outcome and no isolated shape effect.
- Impacts of cadmium and microplastics on Neocaridina denticulata sinensis: Survival, growth, biochemistry, histopathology and gut microbiome: candidate. Publisher text confirms a 14-day nominal 1 microgram/L cadmium comparison with 20000 or 20000000 polystyrene particles/L followed by 7 days in clean water, but aquarium replication, animal denominators, assignment, measured exposure and endpoint analysis units remain unavailable without the full methods.
Next scheduled search: February 12, 2027. Also governs: microplastic-exposure
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.