Estudos do comportamento do camarão Neocaridina davidi var red quando exposto a diferentes espetros de luz

What was studied

Study shape: The first four-week trial placed a new 15-shrimp group in each of four aquaria each week while one lamp colour remained assigned to each aquarium. The second 20-day trial kept four 15-shrimp groups in their aquaria while rotating the four lamps every five days. An observer counted shrimp inside the lit Petri dish, inside the unlit Petri dish and elsewhere every five minutes during five one-hour periods per day. Lamp spectra were reported as relative spectral distributions, and the lit-dish count was analysed with a generalized linear mixed model followed by Tukey comparisons.

Experimental unit: In the first trial, aquarium and light colour were completely confounded even though four successive shrimp groups entered each tank. In the second, aquarium-period was the assigned unit, giving four five-day tank-periods per colour while the same four groups were counted repeatedly. The thesis reports 5,200 count occasions per trial but does not state the model formula, response family, random effects, repeated-measures correlation, lamp order or carryover treatment.

Endpoints: number inside the lit Petri dish, number inside the unlit Petri dish, number elsewhere in the aquarium, qualitative movement, observed mortality, births and molts.

Claim boundary

What it can support: Under this two-dish apparatus, the mean number counted inside the lit dish differed by lamp colour in both trials. Reported lit-dish means were 3.70 red, 1.76 green, 0.93 white and 0.03 blue in the first trial, and 4.03 red, 1.74 green, 1.32 white and 0.01 blue in the rotating-lamp trial. The result supports a short-term colour-associated location-count signal that merits a better controlled replication.

What it cannot support: The thesis does not establish a preferred aquarium spectrum or a welfare ranking. It compared one coloured lit area with one dark area rather than offering simultaneous colour choices, kept the lit area on the left, did not measure or equalize irradiance or illuminance, reported only normalized spectral shapes and did not report observer blinding. Red shrimp can also differ in detectability under different coloured lamps. The stated 20:00 to 08:00 light period does not overlap the stated 09:00 to 19:00 observations, leaving the exposure timing internally unresolved. The first-trial methods state 240 adults while the abstract states n = 120. Phase one cannot separate lamp colour from aquarium; phase two does not report lamp sequence, washout or carryover control; and the statistical formula and random effects are absent despite thousands of correlated repeat counts. Sex, individual identity, lamp output drift and births entering counts were not resolved. No stress biomarker, growth, survival comparison, reproductive rate or chronic colony outcome was measured. Absence of observed deaths and incidental births or molts cannot show comfort, health benefit or reproductive superiority. Do not recommend red light, warn against blue light, specify a spectrum or photoperiod, infer colour vision, or use lamp attraction as a capture method from this study.

Publication status audit

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Correction impact

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Editorial review required (7)

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• behaviour decision card Tank-side decision card
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• habitat decision card Tank-side decision card
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• behaviour practical guide Practical guide
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• habitat practical guide Practical guide
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• light-environment knowledge gap Canonical knowledge gap
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• light-environment answerability brief Answerability brief
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• light-environment research allocation Current research allocation
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• Estudos do comportamento do camarão Neocaridina davidi var red quando exposto a diferentes espetros de luz Canonical evidence page
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Historical record needs follow-up decision (2)

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• Do assigned light spectrum, intensity or photoperiod comparisons establish an aquarium lighting regime for Neocaridina? Dated literature search
  The dated search used this exact source as a candidate (included: Estudos do comportamento do camarão Neocaridina davidi var red quando exposto a diferentes espetros de luz). Preserve the search history and decide whether a revised or additional search is required.
• Lit-dish counts do not establish the best shrimp light Historical research change
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