Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus
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...
| Autor principal: | Muusze, Bie |
|---|---|
| Outros Autores: | Marcon, Jaydione Luíz, van den Thillart, Guido Eejm, Almeida-Val, Vera Maria Fonseca |
| Grau: | Trabalho Apresentado em Evento |
| Idioma: | English |
| Publicado em: |
Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/19970 |
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oai:repositorio:1-19970 |
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dspace |
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oai:repositorio:1-19970 Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus Muusze, Bie Marcon, Jaydione Luíz van den Thillart, Guido Eejm Almeida-Val, Vera Maria Fonseca 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 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. 2020-06-16T17:29:08Z 2020-06-16T17:29:08Z 1998 Trabalho Apresentado em Evento https://repositorio.inpa.gov.br/handle/1/19970 10.1016/S1095-6433(98)10023-5 en Volume 120, Número 1, Pags. 151-156 Restrito Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
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 |
| spellingShingle |
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 Muusze, Bie Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| topic_facet |
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 |
| description |
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. |
| format |
Trabalho Apresentado em Evento |
| author |
Muusze, Bie |
| author2 |
Marcon, Jaydione Luíz van den Thillart, Guido Eejm Almeida-Val, Vera Maria Fonseca |
| author2Str |
Marcon, Jaydione Luíz van den Thillart, Guido Eejm Almeida-Val, Vera Maria Fonseca |
| title |
Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| title_short |
Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| title_full |
Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| title_fullStr |
Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| title_full_unstemmed |
Hypoxia tolerance of Amazon fish respirometry and energy metabolism of the cichlid Astronotus Ocellatus |
| title_sort |
hypoxia tolerance of amazon fish respirometry and energy metabolism of the cichlid astronotus ocellatus |
| publisher |
Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/19970 |
| _version_ |
1787144152413110272 |
| score |
11.755432 |