Application of artificial photoperiod in fish: a factor that increases susceptibility to infectious diseases?
| Autor: | Nancy Contreras, Meyling Rivas, Katherine Alveal, Ítalo Fernández, Víctor Campos, Francisco Yáñez, Ariel Valenzuela, Alfredo E. Klempau, Pamela Gutiérrez, Ciro Oyarzún |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
endocrine system
Veterinary medicine Physiology Photoperiod Flavobacterium psychrophilum Aquaculture Aquatic Science Biochemistry Flavobacterium Lethargy Fish Diseases Pseudomonas Animals biology business.industry Ecology General Medicine Saprolegnia biology.organism_classification Trout Aeromonas Oncorhynchus mykiss Rainbow trout business Gram-Negative Bacterial Infections |
| Zdroj: | FISH PHYSIOLOGY AND BIOCHEMISTRY Artículos CONICYT CONICYT Chile instacron:CONICYT |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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