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Field observation Direct Neocaridina evidence

Population ecology of Neocaridina denticulata (De Haan, 1849) in the Sugow River, Japan

Niwa and Hamano, 1990. Researches on Crustacea 19: 43-54.

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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 denticulata from the Sugow River in Japan
Environment
An approximately 50-square-metre vegetated river reach sampled 26 times from May 1985 through May 1986
Life stages
newly hatched field juvenile, adult male, adult female, ovigerous female
Reviewed
2026-08-12

What was studied

Study shape: Daytime sweep-net collections lasting two to three hours were measured to 0.1 mm body length and grouped into inferred seasonal cohorts; a later three-mesh comparison examined size selectivity.

Experimental unit: Collection date and sampled river reach, with individual measurements nested within each collection

Endpoints: body-length frequency, sex ratio, ovigerous season, smallest ovigerous length, inferred cohort timing and growth.

Claim boundary

What it can support: Across 19,084 collected shrimp, newly hatched animals appeared in samples from June through August and length-frequency analysis supported three seasonal cohort types in this river population.

What it cannot support: Cohorts were inferred rather than composed of marked animals, daytime effort was time based, net selectivity affected small animals and sex below 8 mm was allocated using an estimated ratio. The results do not establish N. davidi aquarium age, maturity or lifespan.

Publication status audit

Matched in dated Crossref query

The canonical DOI appeared in the dated broad query and carried no registered update in that response. This is a metadata observation, not proof that the work has never changed.

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 (6)

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

  • breeding 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.
  • growth 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.
  • sexing 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.
  • breeding practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • growth practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • sexing 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 (16)

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

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How this record is classified

Field observation: Animals were observed in a field population. Occurrence and association do not create a home-aquarium optimum or prove causation.

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

Topics: Growth and lifespan, Breeding, Anatomy, Wild populations

Critically appraise this source without a score

These questions fit this record's field observation 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. Sampling frame: How were sites, dates, habitats and animals selected, and what population can that sampling represent? Convenient or uneven sampling limits prevalence, abundance and seasonal inference.
  8. Sampling effort: Was effort standardized or recorded across sites, times and environmental conditions? Observed counts can change because detectability or effort changed rather than the population.
  9. Association: Which co-varying environmental or biological factors could explain the observed association? Field correlation does not by itself identify cause or a husbandry intervention.
  10. Detection and absence: Could non-detection reflect gear, visibility, season, behavior or identification limits? Not observed is not equivalent to absent.

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