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Application of artificial photoperiod in fish: a factor that increases susceptibility to infectious diseases?
Valenzuela, Ariel; Campos, Victor; Yañez, Francisco; Alveal, Katherine; Gutiérrez, Pamela; Rivas, Meyling; Contreras, Nancy; Klempau, Alfredo; Fernandez, Italo; Oyarzun, Ciro.
Afiliação
  • Valenzuela A; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile. avalenz@udec.cl.
  • Campos V; Laboratory of Microbiology, Faculty of Biological Sciences, University of Concepción, Concepción, Chile.
  • Yañez F; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Alveal K; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Gutiérrez P; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Rivas M; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Contreras N; Master's Program in Zoology, Graduate School, University of Concepción, Concepción, Chile.
  • Klempau A; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Fernandez I; Laboratory of Pisciculture and Aquatic Pathology, Oceanography Department, Faculty of Natural and Oceanographic Sciences, University of Concepción, Concepción, Chile.
  • Oyarzun C; Laboratory of Microbiology, Faculty of Biological Sciences, University of Concepción, Concepción, Chile.
Fish Physiol Biochem ; 38(4): 943-950, 2012 Aug.
Article em En | MEDLINE | ID: mdl-22160663
This paper describes and evaluates the mortality associated with the potential stressor effect induced by application of artificial photoperiods in rainbow trout (Oncorhynchus mykiss). After application of artificial photoperiods, high mortalities of trout subjected to this management were recorded (36% in LD 14:10 and 25% in LD 24:0) as compared to controls (7%). The recorded signology related to diseased trout included darkening, lethargy and erratic swimming. Among the morphological changes, skin lesions and ulcerative-type necrosis could be observed. Blood tests, histopathology and isolation of pathogens identified as Flavobacterium psychrophilum, associated with Aeromonas, Pseudomonas and Saprolegnia sp., were performed. The application of artificial photoperiods suggests that fish may be more susceptible to opportunistic diseases; thus, it is advisable to emphasize preventive measures in fish subjected to this management.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Infecções por Bactérias Gram-Negativas / Fotoperíodo / Oncorhynchus mykiss / Doenças dos Peixes Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Fish Physiol Biochem Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Chile País de publicação: Holanda
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Infecções por Bactérias Gram-Negativas / Fotoperíodo / Oncorhynchus mykiss / Doenças dos Peixes Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Fish Physiol Biochem Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Chile País de publicação: Holanda