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Registros recuperados: 5
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Different biochemical strategies of two Neotropical fish to cope with the impairment of nitrogen excretion during air exposure BJMBR
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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Endurcissement du naissain d’huîtres creuses, Crassostrea gigas par le niveau d’exondation ou la densité d’élevage : récapitulatif d’essais conduits entre 2004 et 2007 en rivière d’Auray (56), pour réduire les mortalités estivales ArchiMer
Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Claude, Serge.
This report summarizes a list of husbandry experiments conducted between 2004 and 2007 so as to reduce the summer mortalities of the oyster Crassostrea gigas by farming practices. The Japanese technique so‐called “hardening”, based on nursing the young oysters (less than 1 year‐old) in intertidal areas with high air exposure, is tested and adapted. Significant improvements of survival rates (e.g. 60% survival instead of 40% survival rate) have been obtained by transferring the spat only a few month (between march and june‐july) on “high” inter‐tidal farming plots (up to 40% of mean air exposure time). In such conditions, growth is transiently reduced, but a compensatory growth seems to happen when oysters are transferred back on low concessions. Another...
Tipo: Text Palavras-chave: Huître; Crassostrea gigas; Mortalité; Endurcissement; Exondation; Densité; Oyster; Crassostrea gigas; Mortality; Hardening; Air exposure; Density.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00042/15350/12705.pdf
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Performance and stress resistance of Nile tilapias fed different crude protein levels R. Bras. Zootec.
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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Physiological responses of pirarucu (Arapaima gigas) to acute handling stress Acta Amazonica
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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Resistência ao estresse e crescimento de larvas de peixes neotropicais alimentadas com diferentes dietas. Repositório Alice
LUZ, R.K..
O objetivo deste trabalho foi avaliar o efeito da alimentação na resistência ao estresse e no crescimento de larvas das espécies de peixes neotropicais: Astronotus ocellatus (Oscar), Piaractus mesopotamicus (pacu) e Pseudoplatystoma coruscans (pintado). As larvas receberam diferentes tipos de alimentos (Artemia sp., larvas de Colossoma macropomum e dieta artificial Fry Feed Kyowa). Foram realizados testes de exposição ao ar e a taxa de sobrevivência, determinada 24 horas depois. A fim de avaliar o crescimento, medidas de peso foram realizadas em larvas dos diferentes tratamentos. Larvas de A. ocellatus alimentadas com náuplios de Artemia sp. apresentaram tendência de maior peso e resistência ao estresse, quando comparadas com o uso de dieta artificial....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Alimentação; Exposição ao ar; Larvicultura; Astronotus ocellatus; Piaractus mesopotamicus; Pseudoplatystoma coruscans; Feeding; Air exposure; Larviculture.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/120740
Registros recuperados: 5
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