Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/19970
Título: Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus
Autor: Muusze, Bie
Marcon, Jaydione Luíz
van den Thillart, Guido Eejm
Almeida-Val, Vera Maria Fonseca
Palavras-chave: Lactic Acid
Anaerobic Glycolysis
Animals Experiment
Animals Model
Animals Tissue
Breathing Rate
Conference Paper
Controlled Study
Ecology
Energy Metabolism
Fish
Hypoxia
Lactate Blood Level
Lake
Metabolic Inhibition
Metabolic Rate
Nonhuman
Seasonal Variation
Spirometry
Stress
Animalsia
Astronotus Ocellatus
Astronotus Ocellatus
Cichlidae
Vertebrata
Data do documento: 1998
Editor: Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology
É parte de: Volume 120, Número 1, Pags. 151-156
Abstract: As a result of regular flood pulses, the Amazon basin exhibits large annual changes in its chemical and physical parameters. Ecology and distribution of fish communities seem to be directed by seasonal and diurnal oxygen level oscillations. Amazon fish have developed strategies to thrive under these varying conditions. Astronotus ocellatus normally survives large fluctuations in oxygen availability in varzea lakes. Respirometric and metabolic changes in A. ocellatus were studied during exposure to stepwise declining oxygen levels. Respiration rates were continuously recorded. Haematologic and metabolic parameters (lactate, glucose, cortisol and free fatty acids (FFA)) were determined. A. ocellatus was found to be hypoxia tolerant; it survives more than 16 h of severe hypoxia (pO2 ≤ 0.4 mg l- 1) and even 4 h of complete anoxia at 28°C. Its routine metabolic rate is 10.8 mg O2 h-1 per 100 g fresh weight. A significant decrease in standard metabolic rate (SMR) starts at 20% air saturation, whereas a significant change of blood lactate does not start until 6% air saturation in water. We suggest therefore that A. ocellatus responses to environmental hypoxia are based mainly on suppressed metabolic rate, whereas under deep hypoxia or anoxia partial compensation is obtained from anaerobic glycolysis.
DOI: 10.1016/S1095-6433(98)10023-5
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