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Behavioural and physiological responses to low- and high-intensity locomotion in Chinese shrimp Fenneropenaeus chinensis.
Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology 2018 November 24
We explored stroke behaviour, energy sources, and their related metabolic enzymes during multi-intensity swimming and tail-flipping at low- and high-intensity modes in Chinese shrimp Fenneropenaeus chinensis. In swimming, shrimp were encouraged to swim at velocities of 3, 6, 9 cm s-1 for 200 min (low-intensity), and at 12, 15, 18 cm s-1 until fatigue (high-intensity). In tail-flipping, shrimp were encouraged to tail-flip by tapping cephalothorax at frequencies of 0.020, 0.040, 0.063 Hz (one tap every 50, 25, 16 s) for 5 min (low-intensity), and at 0.083, 0,100, 0.125 Hz (one tap every 12, 10, 8 s) until no response (high-intensity). Results showed that shrimp increased stroke rates of pleopods and uropods to elevate swimming and tail-flipping ability. For low-intensity locomotion, glycogen was burned in aerobic pathway due to low pleopods beat frequency in swimming; however, glycogen was anaerobically burned due to high uropods beat amplitude in tail-flipping. Anaerobic metabolism occurred in high-intensity locomotion in either swimming or tail-flipping. Critical contents of muscle lactate causing locomotion fatigue might be around threefold of rest condition. Shrimp reduced locomotive time to avoid glycogen exhaustion and lactate accumulation during high-intensity locomotion. These findings highlight our understanding of physiological mechanisms of locomotion activities in shrimp.
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