水生生物学报2013，Vol.37Issue(2)：314-320,7.DOI:10.7541/2013.20
溶氧水平对鳊鱼、中华倒刺鲃幼鱼游泳能力的影响
THE EFFECTS OF DISSOLVED OXYGEN LEVEL ON THE SWIMMING PERFORMANCES OF JUVENILE PARABRAMIS PEKINENSIS AND SPINIBARBUS SINENSIS
摘要
Abstract
To investigate the effect of dissolved oxygen (DO) level on swimming performance of juvenile Chinese bream (Parabramis pekinensis) [n=32, body mass: 4.70±0.11 g] and Qingbo (Spinibarbus sinensis) [n=32, body mass: 3.26±0.06 g], we measured the critical swimming speed (Ucrit) and swimming metabolic rate (MO 2) and calculated the resting metabolic rate (AfO2rest), maximum metabolic rate (MO2max), metabolic scope (MS), and cost of transport (COT) during swimming at 25℃ and DO 8 (100% saturation), 4, 2, and 1 mgO2/L. Ucrit values of Chinese bream and Qingbo were 8.47 ± 0.19 vs 9.49 ± 0.14, 7.40 ± 0.17 vs 9.40 ± 0.28, 5.64 ± 0.16 vs 7.51 ± 0.21 and 4.02 ±0.23 vs 4.75 ± 0.13 BL/s at above different DO levels, respectively. Ucrit decreased significantly with DO in both fish species (P<0.05) except that of Qingbo between 4 and 8 mgO2/L. Ucrit of Qingbo was significantly higher than those of Chinese bream under all DO levels (P<0.05). Both MO2max and MS decreased significantly with DO from 8 to 1 (P<0.05) while MO2rest showed a significantly decrease till DO was below 1 mgO2/L. In comparison, MO2 increased significantly with Ucrit (P<0.05). COT of both fish species decreased with Ucrit within lower swimming speed range but remained unchanged at high Ucrit range. COT of Qingbo was lower than that of Chinese bream (P<0.05). In addition, COT decreased with DO, suggesting that down-regulation of the physiological processes under hypoxic conditions. When DO decreased from 100% to 50%, Chinese bream showed a 13% decrease in Ucrit due to the decreased respiratory capacities (as suggested by a 32% decrease inMO2max) while Qingbo showed no significant decrease in Ucrit despite a 20% decrease inMO2max due to the decrease in maintaining metabolism and COT. However, when DO decreased to 12.5%, both Qingbo and Chinese bream showed similar decreases in Ucrit compared to those under 100% DO (53% vs 50%). This observation suggested that the swimming performance varied differently with the DO decrease between Chinese bream and Qingbo and was closely related to the metabolic strategy of different fish species.关键词
鳊鱼/中华倒刺鲃/溶氧水平/临界游泳速度/游泳能力/代谢率/适应对策Key words
Parabramis pekinensis/ Spinibarbus sinensis/ Dissolved oxygen level/ Critical swimming speed/ Swimming capacity/ Metabolic rate/ Adaptive strategy分类
生物科学引用本文复制引用
赵文文,曹振东,付世建..溶氧水平对鳊鱼、中华倒刺鲃幼鱼游泳能力的影响[J].水生生物学报,2013,37(2):314-320,7.基金项目
国家自然科学基金项目(No.31172096) （No.31172096）
重庆市自然科学基金(2010BB1089) （2010BB1089）
重庆市科技创新能力建设项目(CSTC,2010 CA1010)资助 （CSTC,2010 CA1010）
