Abstract
Locomotor activity of troglobitic (cave restricted) catfishes, Trichomycterus sp., was recorded in the laboratory under constant darkness for ten consecutive days. Infra-red photocell beam crossings were totalled every thirty minutes and stored for later analysis. Spectral analysis of the data followed by a statistical test designed for the detection of significant components was then performed. The results of 14 individuals, seven pigmented and seven albino fishes, are reported here. In eight individuals, four pigmented and four albinos, we were not able to detect significant components in the circadian range, although ultradian and/or infradian significant components were found in all cases. Former studies on other two Brazilian cave catfishes, Pimelodella kronei and Imparfinis sp., showed similar results, suggesting a picture of gradual loss of circadian rhythmicity and persistence of ultradian and infradian rhythms in the locomotor activity of troglobitic populations. The proportion of specimens witho...
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