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- Title
Effects of water temperature on oxygen consumption rate, ammonia excretion rate and asphyxiation point of juvenile Scatophagus argus.
- Authors
JIANG Fei; XU Jiabo; SHI Yonghai
- Abstract
[Objective] The effects of different water temperatures on respiratory metabolism of juvenile Scatophagus argus were investigated to provide evidence for determination of suitable temperature. [Method] Effects of different water temperatures (15,20,25,30 and 35 °C) on oxygen consumption rate, ammonia excretion rate, metabolic rate, excretion rate, oxygen nitrogen ratio, respiratory Q10, excretory Q10 and asphyxiation point of juvenile S. argus at weight of (8.84 ± 0.32) g cultured in low-salt water with salinity of 5 were studied by closed breathing experimental method. [Result] The oxygen consumption rate, ammonia excretion rate, metabolic rate and excretion rate increased with the increase of water temperature in the range of 15-30 °C. The peaks at 30 °C were 0.46 mg/(g • h),3.81 µg/(g • h), 6.29 J/(g • h) and 0.09 J/(g • h), respectively. The values began to decrease at 35 °C. In the range of 15 - 35 °C, the asphyxiation point increased with the increase of water temperature, and the average oxygen nitrogen ratio (O : N) at 15 - 35 °C was 71.76 - 261.04. The average respiratory Q10 for all temperatures was 2.50 and the respiratory Q10 at 20 - 25 °C was 1.22. The average excretory Q10 for all temperatures was 2.23 and the excretory Q10 at 25 - 30 °C was 1.10. [Conclusion] Carbohydrates and fats mainly provided energy for juvenile S. argus under salinity of 5. The suitable water temperature was 15 - 30 °C for culturing juvenile S. argus with optimum range of 20 - 30 °C.
- Subjects
SCATOPHAGUS argus; WATER temperature; OXYGEN consumption; ASPHYXIA; EXCRETION
- Publication
Journal of Northwest A & F University - Natural Science Edition, 2022, Vol 50, Issue 1, p36
- ISSN
1671-9387
- Publication type
Article
- DOI
10.13207/j.cnki.jnwafu.2022.01.005