Lv Xiao, Xie Hang, Xia Danyang, Shen Cong, Li Jian, Luo Yiping
Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China.
Luzhou Agricultural Bureau, National Nature Reserve of Rare and Endemic Fish in the Upper Yangtze River for Luzhou Workstation, Luzhou, 646009, Sichuan, China.
J Comp Physiol B. 2018 Jul;188(4):591-598. doi: 10.1007/s00360-018-1154-5. Epub 2018 Mar 22.
We investigated the body mass (M) scaling of resting metabolic rate (RMR), maximum metabolic rate (MMR), excess post-exercise oxygen consumption (EPOC), blood parameters, and organ masses of black carp (Mylopharyngoden piceus). The results showed that RMR scaled with M of the fish by an exponent (b) of 0.833 (b), which was significantly larger than 0.75. MMR scaled with M by a power of 0.775 (b), which was significantly lower than 1 and may be due to a small size proportion of red muscle. No difference between b and b or correlation between factorial aerobic scope and M was found. However, EPOC scaled positively with M by a power of 1.231, suggesting a constant aerobic capacity and an enhanced anaerobic capacity with fish growth. Mass of the inactive organs scaled with M by a power of 1.005, which was significantly larger than 1 and was negatively correlated with RMR, suggesting that the proportion of inactive organs increases with fish growth, which may contribute to the negative scaling of RMR. Red blood cell surface area (S) did not increase with increasing M, suggesting that the ontogenetic decrease in the surface area to volume ratio of cells may not contribute to the negative scaling of RMR. The predicted b value (0.846) by the average S (1.746 µm²) differs by only 1.62% from the observed b value using our previously reported S - b function in carp, suggesting that the species-specific cell size, rather than its ontogenetic change, affects the metabolic scaling of a species.
我们研究了青鱼（Mylopharyngoden piceus）的体重（M）与静息代谢率（RMR）、最大代谢率（MMR）、运动后过量耗氧量（EPOC）、血液参数以及器官质量之间的关系。结果表明，青鱼的RMR与体重M的指数（b）为0.833，显著大于0.75。MMR与体重M的幂为0.775，显著低于1，这可能是由于红肌比例较小所致。未发现b与b之间存在差异，也未发现有氧范围系数与体重M之间存在相关性。然而，EPOC与体重M呈正相关，幂为1.231，这表明随着鱼的生长，有氧能力保持恒定，无氧能力增强。非活动器官的质量与体重M的幂为1.005，显著大于1，且与RMR呈负相关，表示非活动器官的比例随着鱼的生长而增加，这可能导致RMR呈负相关。红细胞表面积（S）并未随着体重M的增加而增加，这表明细胞表面积与体积比的个体发育性降低可能并非RMR呈负相关的原因。根据平均S（1.746 µm²）预测的b值（0.846）与使用我们之前报道的鲤鱼S - b函数观察到的b值仅相差1.62%，这表明特定物种的细胞大小而非其个体发育变化影响了物种的代谢比例关系。
