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Controlled experiment Direct Neocaridina evidence

Effects of different feed types and feeding frequencies on growth performance, moulting cycle, reproductive efficiency and carapace coloration of red cherry shrimps Neocaridina davidi

Elmas, 2019. Izmir Katip Celebi University MSc thesis.

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This record is a claim boundary, not a quality badge. Evidence class and species relationship describe what was studied. They do not make the result universal, complete or automatically applicable to a home aquarium.

Source taxon as published
Neocaridina davidi
Environment
Twelve 40-litre laboratory aquaria at about 26 C across a 12-week feeding trial with twice-weekly 25 percent water changes
Life stages
growing shrimp, adult male, adult female, embryo
Reviewed
2026-08-12

What was studied

Study shape: Two commercial grow-out feeds and feeding once or three times daily formed a two-by-two design with three aquaria per treatment, ten shrimp per aquarium and a starting sex ratio of six females to four males.

Experimental unit: The 40-litre aquarium, with three aquaria per feed and frequency combination

Endpoints: feed consumption, weight, total length, carapace length, survival, shed exoskeleton count, egg and hatch measures, carapace lightness and colour coordinates.

Claim boundary

What it can support: Under this exact protocol, feeding frequency changed several growth, survival, shed-exoskeleton and reproductive outcomes, while the two tested products also differed for selected reproductive and colour measures.

What it cannot support: The daily ration was not reported, feed consumption differed among groups and the products differed in more than their intended species. Shed exoskeletons were counted by aquarium rather than linked to identified individuals. The thesis does not establish three daily meals for a home colony, isolate an ingredient effect or provide a pellet amount.

Publication status audit

No canonical DOI in registry

The evidence record uses another stable source URL. Crossref DOI update metadata cannot audit it.

Metadata snapshot reviewed 2026-08-12. Inspect the method, unmatched queue and limitations.

Correction impact

If this source boundary changes, these are the known downstream consumers. The list distinguishes scientific re-review from generated parity and historical follow-up.

Editorial review required (4)

This curated wording or synthesis must be reconsidered when the source boundary changes. A passing generator test cannot decide the new scientific meaning.

  • feeding decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • molting decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • feeding practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • molting practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.

Generated from governing registry (13)

This surface derives from a governing registry and should update with it, but release tests must still prove parity and routing.

Inspect the corpus-wide propagation audit.

How this record is classified

Controlled experiment: An assigned treatment or controlled comparison. The treatment, unit, duration and endpoint still limit the claim.

Direct Neocaridina evidence: The source measured animals named within Neocaridina. Direct still does not mean universal or sufficient.

Topics: Feeding, Growth and lifespan, Molting, Breeding, Colour

Critically appraise this source without a score

These questions fit this record's controlled experiment role. They are prompts, not automatic judgments. Open the original source to answer them.

  1. Identity and provenance: How were the organism, population, stock and life stage identified and sourced? A published name or seller label can hide a taxonomic, population or life-stage transfer.
  2. Independent unit: What unit was independently assigned or sampled, and how many units support each comparison? Animal counts do not create independent replication when animals share a vessel, site, family or treatment history.
  3. Comparison and context: What was the actual comparator, allocation process, environment, duration and material condition? A result has meaning only against the comparison and conditions that produced it.
  4. Endpoint and measurement: Which endpoint was measured, with what method, unit, timing, resolution and decision rule? One endpoint cannot silently become survival, welfare, diagnosis, reproduction or long-term population performance.
  5. Denominators and missingness: Are starting counts, exclusions, losses, missing observations and analysis denominators reconciled? Unreported or changing denominators can alter the apparent direction, precision and applicability of a result.
  6. Transfer boundary: What is the nearest tempting aquarium claim that this source design cannot establish? Direct evidence can still be narrow, and adjacent evidence can be useful only while the inference remains visible.
  7. Treatment assignment: Were independent units assigned to treatments, and were baseline conditions comparable? Unclear allocation or baseline imbalance can confound the treatment comparison.
  8. Replication: Were treatment vessels or other exposure units independently replicated rather than subsampled? Repeated animals or assays inside one exposure unit do not replicate the environmental treatment.
  9. Exposure verification: Was the treatment, dose, feed intake or environmental exposure measured and maintained as described? Nominal treatment labels may not equal the exposure animals actually received.
  10. Analysis: Did the statistical model match the unit, repeated measures, multiplicity and missing outcomes? A precise p-value cannot repair a mismatched unit or unaccounted comparison structure.

Read the complete appraisal framework.

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