Effects of temperature and salinity on oxygen consumption and ammonia excretion of juvenile miiuy croaker, <Emphasis Type="Italic">Miichthys miiuy</Emphasis> (Basilewsky) |
| |
| Authors: | Zhongming Zheng Chunhua Jin Mingyun Li Peifeng Bai Shuanglin Dong |
| |
| Institution: | (1) The Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao, 266003, P.R. China;(2) Faculty of Life Science and Bioengineering, Ningbo University, Ningbo, 315211, Zhejiang, P.R. China |
| |
| Abstract: | The metabolic responses of the juvenile Miichthys miiuy in terms of oxygen consumption and ammonia excretion to changes in temperature (6–25°C) and salinity (16–31 ppt) were investigated.
At a constant salinity of 26 ppt, the oxygen consumption rate (OCR) of the fish increased with an increase in temperature
and ranged between 133.38 and 594.96 μg O2 h−1 g−1 DW. The effect of temperature on OCR was significant (P < 0.01). Q10 coefficients were 6.80, 1.41, 1.29 and 2.36 at temperatures of 6–10, 10–15, 15–20 and 20–25°C, respectively, suggesting that
the juveniles of M. miiuy will be well adapted to the field temperature in the summer, but not in the winter. The ammonium excretion rates (AER) of
the fish were also affected significantly by temperature (P < 0.01). The O:N ratio at temperatures of 6, 10, 15 and 20°C ranged from 13.12 to 20.91, which was indicative of a protein-dominated
metabolism, whereas the O:N at a temperature of 25°C was 51.37, suggesting that protein-lipids were used as an energy substrate.
At a constant temperature of 15°C, the OCRs of the fish ranged between 334.14 (at 31 ppt) and 409.68 (at 16 ppt) μg O2 h−1 g−1 DW. No significant differences were observed in the OCR and AER of the juveniles between salinities of 26 and 31 ppt (P > 0.05). The OCR and AER at 16 ppt were, however, significantly higher than those at 26 and 31 ppt (P < 0.05), indicating salinity lower than 16 ppt is presumably stressful to M. miiuy juveniles. |
| |
| Keywords: | Sciaenidae Nitrogenous excretion Metabolic rate Temperature Salinity Q10 |
| 本文献已被 SpringerLink 等数据库收录！ |
|
