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Provedor de dados:  Neotropical Ichthyology
País:  Brazil
Título:  Preference behavior of silver catfish, Rhamdia quelen, juveniles in waters with pH gradients: laboratory experiments
Autores:  Golombieski,Jaqueline Ineu
Becker,Alessandra Janaína
Almeida,Caroline Bruzza
Almeida,Ana Paula Gottlieb
Baldisserotto,Bernardo
Data:  2013-09-01
Ano:  2013
Palavras-chave:  Behavior
Calcium
Hardness
Ichthyophthirius multifiliis
Shelter
Resumo:  The aim of this study was to determine the preferred pH in silver catfish Rhamdia quelenjuveniles 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 CaCO3 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, 10, and 12 h after transfer. Acclimation to different water hardness did not change pH preference of uninfected silver catfish (pH 7.30-7.83), and the presence of a shelter at the preferred pH or outside this preferred pH did not change the chosen pH range, either. Consequently silver catfish favored the acid-base regulation over shelter seeking tendency. Juveniles infected with I. multifiliis acclimated to water hardness of 24 mg CaCO3 L-1 preferred alkaline pH (9.08-9.79). This choice is not explained by the higher Na+ levels at alkaline pH compared to neutral pH because infected and uninfected fish choose the same waterborne Na+ levels in a Na+ gradient with the same pH.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300661
Editor:  Sociedade Brasileira de Ictiologia
Relação:  10.1590/S1679-62252013000300019
Formato:  text/html
Fonte:  Neotropical Ichthyology v.11 n.3 2013
Direitos:  info:eu-repo/semantics/openAccess
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