DOI: 10.1590/s1679-62252013000300019
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Abstract: The aim of this study was to determine the preferred pH in silver catfish Rhamdia quelen juveniles acclimated to different water hardness and the effect of shelters and infection by Ichthyophthirius multifiliis. Fish were acclimated for two weeks at different water hardness levels (4, 24, 50, or 100 mg CaCO 3 L -1) and then transferred to a polyethylene tube with a pH gradient ranging from 3.5 to 11.7 and maintaining the same hardness. The position of the fish in the pH gradient was observed at 1, 2, 4, 6, 8, … Show more

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