Data/hora: 03/06/2024 15:32:15

Provedor de dados: 	2	
País: 	Brazil	
Título: 	Ammonia excretion at different life stages of silver catfish - 10.4025/actascianimsci.v34i1.11898	
Autores: 	Garcia, Luciano de Oliveira; Universidade Federal do Rio Grande; Braun, Neiva; Universidade Federal de Santa Catarina; Becker, Alexssandro Geferson; Universidade Federal de Santa Maria; Loro, Vania Lúcia; Universidade Federal de Santa Maria; Baldisserotto, Bernardo; Universidade Federal de Santa Maria.	
Data: 	2011-11-01	
Ano: 	2011	
Palavras-chave: 	5.06.03.04-3 eggs; Fasting time; Nitrogenous compound; Larvae.	
Resumo: 	This study examined ammonia excretion at different life stages (eggs, larvae and juveniles) in silver catfish (Rhamdia quelen) and determined the influence of fasting time on ammonia excretion. Eggs and larvae were collected from incubators at different times after fecundation and placed in chambers. Juveniles were separated into two weight classes (2–50 g and 150-320 g) and placed in individual chambers after feeding. Water was collected from each chamber to determine ammonia excretion. Ammonia excretion by the eggs was low, but when hatching began approximately 28h after fecundation, excretion increased until 48h after fecundation. In fasting silver catfish juveniles, there was a significant negative correlation between ammonia excretion and weight. Moreover, ammonia excretion decreased significantly after 12 and 48h of fasting (compared to 6h fasting) in the smallest and largest specimens, respectively. Consequently, during incubation of silver catfish eggs, water renovation must be increased at hatching time to avoid a build-up in the concentration of ammonia. In addition, as ammonia excretion in this species increases after feeding, feed must be discontinued when ammonia levels in the tanks are high to avoid a further increase of this metabolite and consequent mortality of silver catfish.	
Tipo: 	Análise laboratorial	
Idioma: 	Inglês	
Identificador: 	http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/11898

10.4025/actascianimsci.v34i1.11898	
Editor: 	Editora da Universidade Estadual de Maringá	
Relação: 	http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/downloadSuppFile/11898/44605	
Formato: 	application/pdf

application/pdf	
Fonte: 	Acta Scientiarum. Animal Sciences; v. 34, n. 1 (2012); 15-19

Acta Scientiarum. Animal Sciences; v. 34, n. 1 (2012); 15-19	
Fonte: 	DECLARATION OF ORIGINALITY AND CESSATION OF COPYRIGHTI Declare that current article is original and has not been submitted for publication, in part or in whole, to any other national or international journal. I also declare that once published in the Acta Scientiarum. Animal Sciences, a publication of the Universidade Estadual de Maringá, it will not be submitted by me or by any co-author to any scientific communication mean. In my name and in the name of co-authors, I shall cede the copyright of the above mentioned article to the Universidade Estadual de Maringá and I declare that I know that the non-observance of this norm may make me liable for the penalties contemplated in the Law for the Protection of Authors’ Rights (Act 9609 of the 19th February 1998).

DECLARAÇÃO DE ORIGINALIDADE E CESSÃO DE DIREITOS AUTORAIS  Declaro que o presente artigo é original, não tendo sido submetido à publicação em qualquer outro periódico nacional ou internacional, quer seja em parte ou em sua totalidade. Declaro, ainda, que uma vez publicado na revista Acta Scientiarum. Animal Sciences, editada pela Universidade Estadual de Maringá, o mesmo jamais será submetido por mim ou por qualquer um dos demais co-autores a qualquer outro meio de divulgação científica. Através deste instrumento, em meu nome e em nome dos demais co-autores, porventura existentes, cedo os direitos autorais do referido artigo à Universidade Estadual de Maringá e declaro estar ciente de que a não observância deste compromisso submeterá o infrator a sanções e penas previstas na Lei de Proteção de Direitos Autorias (Nº9609, de 19/02/98).