不同体质量中华倒刺鲃的静止代谢率和生长性能

为了探讨不同体质量中华倒刺鲃能量代谢和生长能力的差异,在25°C条件下分别测定不同体质量大小(10、20、40、100和180 g组)中华倒刺鲃的静止代谢率(RMR);经过为期28 d投喂养殖实验,测定各实验组的特定生长率(SGR)、摄食率(FR)和饲料转化效率(FE);并测定不同体质量大小(10.4～248.1 g)实验鱼的生长激素(GH)水平。随体质量的增加,中华倒刺鲃个体RMR显著增加,单位体质量RMR显著下降;SGR和FR均显著增加;体质量对FE影响不显著;GH水平与体质量间呈显著负相关(r=-0.753,n=30)。单位体质量RMR与SGR(r=0.586,n=51)和FR(r=0.640,n=51)均呈显著正相关,与FE(r=0.100,n=51)关系不显著;SGR与FR(r=0.956,n=51)和FE(r=0.447,n=30)均呈显著正相关;FR与FE(r=0.245,n=30)关系不显著。研究表明,小体质量中华倒刺鲃具有相对更高的维持能量的消耗和生长潜能,归因于小体质量鱼具有更高的摄食消化及同化能力。

Resting metabolic rate and growth performance in Qingbo (Spinibarbus sinensis) with different body weight

In order to investigate the differences of the energy metabolism and growth capacity of Qingbo (Spinibarbus sinensis) with different bogy mass, the resting metabolic rate (RMR) of this kind of fish with different body mass (10, 20, 40, 100 and 180 g groups) was firstly detected. After a 28-day feeding trial, the specific growth rate (SGR), feeding rate (FR) and the feed efficiency (FE) were tested in these groups as well. On the one hand, the RMR of S. sinensis was significantly increased with the increase of body mass, however, the RMR of unit weight was significantly decreased. Meanwhile, both SGR and FR were significantly increased, while the FE was indistinctly affected, and plasma GH hormone content was significantly negatively correlated with body mass (r = −0.753, n = 30). On the other hand, the RMR of unit mass was significantly positively correlated with SGR (r = 0.586, n = 51) and FR (r = 0.640, n = 51,), however insignificantly correlated with FE (r = 0.100, n = 51). The SGR was positively correlated with both FR (r = 0.956, n = 51) and FE (r = 0.447, n = 30), and the relation between FR and FE was not significantly correlated (r = 0.245, n = 30). All the information above suggested that, smaller S. sinensis can keep higher maintenance energy consumption and growth capacity, and this may be due to their higher digestive and assimilating ability.