Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Ocean College, Beibu Gulf University, Qinzhou, China.
J Comp Physiol B. 2021 Jul;191(4):721-729. doi: 10.1007/s00360-021-01376-8. Epub 2021 May 2.
We examined intraspecific scaling of the resting metabolic rate (RMR) of Nile tilapia (Oreochromis niloticus) under different culture conditions and further explored the allometric relationships between organ mass (heart, liver, brain, gills, viscera, and red muscles) and blood parameters (erythrocyte size and red blood cell counts) and body mass. Oreochromis niloticus were bred in individual and group cultures. The scaling exponent of the RMR in the individual cultures was b = 0.620-0.821 (n = 30) and that in the group culture was b = 0.770 [natural logarithm (ln) RMR = 0.770 ln M - 1.107 (n = 76)]. The results of the two experimental methods were similar and were not significantly different from 0.75 (3/4), as predicted by the metabolic theory of ecology. The active and inactive organs were scaled with body mass by an exponent of 0.940 and 1.012, respectively. There was no significant relationship between the blood parameters and body mass. These results suggest that the differences in the culture methods may not have affected the allometric scaling of O. niloticus metabolism. The proportion of active and inactive organs contributed to allometric changes in the metabolic rate with body mass. Red blood cells in fish are not generally representative, and cell size can only partially explain the allometric scaling of metabolism.
我们研究了尼罗罗非鱼（Oreochromis niloticus）在不同养殖条件下静止代谢率（RMR）的种内比例，并进一步探讨了器官质量（心脏、肝脏、大脑、鳃、内脏和红肌）和血液参数（红细胞大小和红细胞计数）与体质量之间的异速关系。尼罗罗非鱼在个体和群体养殖中进行养殖。个体养殖中 RMR 的比例指数 b 为 0.620-0.821（n=30），群体养殖中 b 为 0.770[自然对数（ln）RMR=0.770lnM-1.107（n=76）]。这两种实验方法的结果相似，与代谢生态学理论预测的 0.75（3/4）没有显著差异。活性器官和非活性器官分别按体质量的 0.940 和 1.012 进行比例缩放。血液参数与体质量之间没有显著关系。这些结果表明，养殖方式的差异可能不会影响 O. niloticus 代谢的异速比例。活性器官和非活性器官的比例变化导致代谢率随体质量的异速变化。鱼类的红细胞通常不具有代表性，细胞大小只能部分解释代谢的异速比例。
