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为了考察饥饿对鱼类游泳能力的影响,在20℃条件下测定了饥饿不同时间(1、14、28 d)的鲫鱼(Carassius carassius)幼鱼的3种游泳能力参数(临界游泳速度,Ucrit;匀加速速度,Ucat;快速启动逃逸速度,Ufast)。结果表明:饥饿时间不同,Ucat分别为Ucrit的131%~152%,而Ufast分别为Ucrit的368%~509%;14~28 d饥饿对Ufast没有显著影响,但导致Ucat和Ucrit分别显著下降14%~32%和24%~29%(P<0.05);Ufast和Ucrit(Ucat)差异在饥饿后增大;由于Ucrit比Ucat对饥饿更为敏感,短期饥饿鲫鱼的Ucat和Ucrit之间的差异也增加;饥饿对活跃代谢率(MO2active)没有显著影响,说明氧气摄取能力不是饥饿鲫鱼Ucrit下降的原因;饥饿的鲫鱼在相同游泳速度下MO2增加,且随游泳速度MO2上升更快(P<0.05),表明饥饿条件下鲫鱼幼鱼Ucrit的下降主要涉及游泳效率的下降和能量底物的缺乏。
In order to investigate the effect of starvation on fish swimming ability, three swimming ability parameters (critical swimming speed, Ucrit; Jurassic carassius) of juvenile Carassius carassius at different times of starvation (1, 14 and 28 d) Uniform acceleration speed, Ucat; quick start escape speed, Ufast). The results showed that the time of starvation was different, Ucat was 131% -152% of Ucrit, Ufast was 368% -509% of Ucrit respectively, while starvation of 14-28 days had no significant effect on Ufast, but Ucat and Ucrit decreased significantly % ~ 32% and 24% -29%, respectively (P <0.05). The difference of Ufast and Ucrit (Ucat) increased after starvation. Because Ucrit was more sensitive to starvation than Ucat, the difference between Ucat and Ucrit of short-term starved crucian carp (P <0.05). The starvation had no significant effect on MO2active, indicating that oxygen uptake capacity was not the reason for the decrease of Ucrit of starved crucian carp. MO2 increased at the same swim speed in starved crucian carp and increased faster with swimming speed MO2 (P <0.05 ), Indicating that the decrease of Ucrit in juvenile crucian carp in starvation mainly involves the decrease of swimming efficiency and the lack of energy substrate.