Particle shape does not affect ingestion and egestion of microplastics by the freshwater shrimp Neocaridina palmata

What was studied

Study shape: One independent run used eight one-shrimp vessels per treatment. A 24-hour concentration series compared fluorescent polyethylene bead mixtures or milled polyvinyl chloride fragments, a separate fragment series added food, and separate groups exposed at 20000 particles/L were either sampled immediately or moved to particle-free vessels with food for four hours.

Experimental unit: Individual 500 mL vessel and shrimp; seven to eight surviving replicates per treatment in one independent run

Endpoints: particles in rinsed whole-shrimp lysate, particles recovered from excretions, body length, sex, observed mortality.

Claim boundary

What it can support: Under this protocol, mean particle recovery in whole-shrimp lysates rose across the 24-hour concentration series, smaller beads were recovered more often than larger beads, particles appeared in four-hour excretion samples and adding food did not produce a significant fragment-uptake difference.

What it cannot support: The source used N. palmata rather than N. davidi and did not independently verify the White Pearl trade identity. Shape was confounded with polymer, size distribution, suspension preparation and optical detection; fragments at or below 5 micrometres were excluded. The supplement reports group summaries rather than animal-level data, one incomplete nominal-versus-actual concentration example, separate highly variable immediate and four-hour groups and no outlier identities or corrected results. Three deaths across different treatments do not establish particle toxicity. Whole-animal lysate cannot localize particles to gut or tissue, and the study measured no chronic survival, growth, reproduction, histology or home-aquarium threshold.

Publication status audit

Matched in dated Crossref query

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Correction impact

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Editorial review required (5)

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Generated from governing registry (10)

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Historical record needs follow-up decision (2)

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• Which direct Neocaridina microplastic studies measure individual growth, reproduction or survival under home-like histories? Dated literature search
  The dated search used this exact source as a candidate (included: Particle shape does not affect ingestion and egestion of microplastics by the freshwater shrimp Neocaridina palmata). Preserve the search history and decide whether a revised or additional search is required.
• Recovered particles are not a measured health effect Historical research change
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