Data/hora: 04/06/2024 18:24:40

Biblioteca(s): 	Embrapa Pesca e Aquicultura.	
Data corrente: 	12/11/2012	
Data da última atualização: 	13/11/2012	
Autoria: 	CRUZ, A. L. da; SILVA, H. R. da; LUNDSTEDT, L. M.; SCHWANTES, A. R.; MORAES, G.; KLEIN, W.; FERNANDES, M. N.	
Afiliação: 	ANDRÉ LUIS DA CRUZ, UNIVERSIDADE FEDERAL DA BAHIA; HUGO RIBEIRO DA SILVA, UNIVERSIDADE FEDERAL DE SÃO CARLOS; LICIA MARIA LUNDSTEDT, CNPASA; ARNO RUDI SCHWANTES, UNIVERSIDADE FEDERAL DE SÃO CARLOS; GILBERTO MORAES, UNIVERSIDADE FEDERAL DE SÃO CARLOS; WILFRIED KLEIN, UNIVERSIDADE DE SÃO PAULO, Ribeirão Preto; MARISA NARCISO FERNANDES, UNIVERSIDADE FEDERAL DE SÃO CARLOS.	
Título: 	Air-breathing behavior and physiological responses to hypoxia and air exposure in the air-breathing loricariid fish, Pterygoplichthys anisitsi.	
Ano de publicação: 	2012	
Fonte/Imprenta: 	Fish Physiology and Biochemistry, 2012.	
Idioma: 	Inglês	
Conteúdo: 	Hypoxic water and episodic air exposure are potentially life-threatening conditions that fish in tropical regions can face during the dry season. This study investigated the air-breathing behavior, oxygen consumption, and respiratory responses of the air-breathing (AB) armored catfish Pterygoplichthys anisitsi. The hematological parameters and oxygen-binding characteristics of whole blood and stripped hemoglobin and the intermediate metabolism of selected tissue in normoxia, different hypoxic conditions, and after air exposure were also examined. In normoxia, this species exhibited high activity at night and AB behavior (2-5 AB h(-1)). The exposure to acute severe hypoxia elicited the AB behavior (4 AB h(-1)) during the day. Under progressive hypoxia without access to the water surface, the fish were oxyregulators with a critical O(2) tension, calculated as the inspired water O(2) pressure, as 47 ± 2 mmHg. At water O(2) tensions lower than 40 mmHg, the fish exhibited continuous apnea behavior. The blood exhibited high capacity for transporting O(2), having a cathodic hemoglobin component with a high Hb-O(2) affinity. Under severe hypoxia, the fish used anaerobic metabolism to maintain metabolic rate. Air exposure revealed physiological and biochemical traits similar to those observed under normoxic conditions.	
Palavras-Chave: 	Air exposure; Oxygen transport cascade.	
Thesagro: 	Anoxia; Ar; Peixe; Respiração.	
Thesaurus Nal: 	Breathing; Fish; Hypoxia; Respiratory physiology.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Pesca e Aquicultura (CNPASA)	
Exemplares: 	CNPASA - (95-1) - UPC - AP - DD - CNPASA-SP41 -  - 2012.041 - DIS