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| Polez,V.L.P.; Moraes,G.; Santos Neto,C.. |
| The exposure of fish to air is normally expected to interfere with the nitrogen excretion process. Hoplias malabaricus and Hoplerythrinus unitaeniatus, two teleost species, display distinct behaviors in response to decreases in natural reservoir water levels, although they may employ similar biochemical strategies. To investigate this point, plasma levels of ammonia, urea, uric acid, and the two urea cycle enzymes, ornithine carbamoyl transferase (OCT) and arginase (ARG), as well as glutamine synthetase (GS) were determined for both species after exposure to air. Plasma ammonia increased gradually during exposure to air, but only H. malabaricus showed increased concentrations of urea. Plasma uric acid remained very low in both fish. Enzymatic activities... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hoplias malabaricus; Hoplerythrinus unitaeniatus; Fish; Urea cycle enzymes; Biochemical adaptation; Air exposure. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000200017 |
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| Luz,Ronald Kennedy; Ribeiro,Paula Adriane Perez; Ikeda,Aline Leite; Santos,André Eduardo Heringer; Melillo Filho,Reinaldo; Turra,Eduardo Maldonado; Teixeira,Edgar de Alencar. |
| The objective of this study was to evaluate the effect of different levels of diet crude protein on the performance and stress resistance rate (Re) of Oreochromis niloticus larvae and fingerlings. In the first experiment, 5, 15 and 25 day-old animals were submitted to 1, 5, 7, 10, 15, 20, 30 and 40 minutes of air exposure on a sieve. In the second experiment, tilapia larvae were fed with 32, 40 and 55% crude protein (CP) diets. Animals after 15 and 30 days of feeding (21 and 36 days of life, respectively) were submitted to the air exposure test for 7 and 10 minutes. Re was estimated based on survival 24 hours after the tests. In the first experiment, it was observed that 5-day-old animals were more resistant than animals with 10 and 20 days of feeding (15... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Air exposure; Feeding; Larviculture; Oreochromis niloticus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200031 |
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| Gomes,Levy de Carvalho. |
| Pirarucu (Arapaima gigas) is an obligatory air-breathing fish from the Amazon basin. Previous study showed that pirarucu juveniles present a latency period in their response to moderate stress (transportation). Therefore the objective of this study was to verify the effects of a prolonged air exposure stress in lactate, glucose, cortisol, haematocrit, haemoglobin, and liver glycogen in pirarucu. Thirty-six fish were handled by netting and subjected to air exposure for 75-min. Six fish were sampled before handling and at 0, 6, 24, 48, and 96h after handling. Fish cortisol, lactate and haematocrit rose after handling, returning to previous unstressed values on the following sampling (6h after handling). Glucose increased significantly after handling and that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pirarucu; Stress; Air exposure; Glycogen; Cortisol; Glucose; Lactate; Haematocrit. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672007000400019 |
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