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| Golombieski,Jaqueline Ineu; Becker,Alessandra Janaína; Almeida,Caroline Bruzza; Almeida,Ana Paula Gottlieb; Baldisserotto,Bernardo. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavior; Calcium; Hardness; Ichthyophthirius multifiliis; Shelter. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300661 |
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| Becker,Alessandra Janaína; Fogliarini,Carine de Oliveira; Souza,Carine de Freitas; Becker,Alexssandro Geferson; Mourão,Rosa Helena Veras; Silva,Lenise Vargas Flôres da; Baldisserotto,Bernardo. |
| ABSTRACT This study investigated the efficacy of essential oils of Lippia alba (EOLA) citral chemotype and Lippia origanoides (EOLO) and their effects on ventilatory frequency (VF) of silver catfish, Rhamdia quelen. Fish were exposed to 50-300 μL L−1 of EOLA and 25-300 μL L−1 of EOLO to determine induction times to sedation, anesthesia, and recovery. Moreover, VF was determined in fish exposed to 5 or 10 μL L−1 of EOLA and of EOLO for 8 h. The increasing concentration of essential oils proportionally decreased sedation and anesthesia induction times. The highest EOLA concentration increased VF of fish from the control group at 1 h of exposure, but VF decreased at both EOLO concentrations after 2 h. The EOLA citral chemotype and EOLO were effective... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Fish; Physiology; Rhamdia quelen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100105 |
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