What photoperiod, intensity and spectrum support Neocaridina welfare and colony outcomes?

Current boundary

An open 2018 thesis found colour-associated differences in short-term lit-dish occupancy, but did not equalize light output, fully specify the repeated-measures model or measure welfare and long-term colony outcomes. Two recent studies also report short colour-specific responses after eyestalk gene knockdown, with incomplete public methods. None establishes an aquarium spectrum, intensity or photoperiod.

What would answer it

Replicated intact-aquarium comparisons that measure irradiance or illuminance at animal level, hold shelter, plants, algae, feed and temperature constant, and follow behaviour, molting, growth, survival and reproduction across life stages.

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 light conditions support observable activity and long-term colony outcomes without confusing spectrum, intensity and habitat.

Primary endpoint: Long-term survival and reproductive output, with time-resolved behavior, molting and growth as separate endpoints.

Minimum design: Replicated intact-aquarium treatments assigning photoperiod, measured animal-level intensity and defined spectrum while holding shelter, plants, algae, feed and temperature constant.

Required reporting: Fixture and spectrum, animal-level irradiance or illuminance method, photoperiod, shading, habitat, temperature, feed, allocation, tank denominators, life-stage counts, blinded observation and missingness.

Community can contribute: Calibrated light and habitat records with standardized time-of-day observations can refine realistic treatments and behavioral questions.

Community observations cannot establish: Fixture names, color appearance and short preference observations cannot establish welfare or a universal photoperiod.

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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: Fixture names and short preference observations confound spectrum, intensity, habitat and temperature without resolving long-term outcomes.

Next permitted unit: Specify measured animal-level light treatments, habitat controls, blinded observation and long-term colony endpoints for external method review.

Activation trigger: A partner can measure spectrum and animal-level intensity while maintaining independently replicated intact aquarium treatments.

Open this question in the complete finite research portfolio.

Do assigned light spectrum, intensity or photoperiod comparisons establish an aquarium lighting regime for Neocaridina?

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

Concepts: photoperiod, light intensity, light spectrum, phototaxis, photosensitivity, molting.

Search surfaces: publisher and DOI records, PubMed, scholarly web indexes, full-text repositories.

Outcome: The open thesis adds direct intact-animal location counts and a rotating-lamp phase, but its apparatus and analysis cannot establish preference, welfare or a home lighting regime. Molecular studies show that eyestalk pathways participate in short light responses and may connect with molt physiology. No reviewed source establishes an aquarium spectrum, intensity or photoperiod, so the gap remains open.

Next scheduled search: February 12, 2027. Also governs: light-environment