Title: Effects of Duration on the Measurement of Swimming Performance of Southern Catfish
Abstract: To investigate the effects of test duration(Δt) on the values of the critical swimming speed(Ucrit) and metabolic rate in juvenile southern catfish(Silurus meridionalis) ,the Ucrit and swimming metabolic rate(VO2) with the velocity increment(Δv) 6. 0 cm·s-1 at water 25 ℃ were measured using two different duration(20,40 min) . The results revealed that:when the duration was 20 and 40 min,the absolutely critical swimming speed(Ua) was(31. 89 ± 1. 29) and(30. 17 ± 0. 98) cm·s-1 while the relative critical swimming speed(Ur) was(4. 22 ± 0. 16) and(4. 05 ± 0. 14) BL·s-1 respectively. Experimental treatment had no significant effect on the values of critical swimming speed;but the maximum swimming metabolic rate of 20 min duration was(183.36 ±12.80) mg ·h-1·kg-1,which was significantly higher than that of40min duration group((139.66±8.75) mg·h-1·kg-1) . Furthermore,for fish in the 40 min duration group,the AMR calculated as the first 20 min and the latter 20 min were(152. 08 ± 10. 79) and(121. 61 ± 6. 68) mg·h-1·kg-1 respectively. The former value was significantly higher than that of the latter(p 0. 05) ,but both were marked lower than that of 20 min duration group(p 0. 05) . The results showed that:test duration had no significant effect as for the measure value of critical swimming speed in juvenile southern catfish while it had remarkable effect on the maximum swimming metabolic rate. The effect may relate to the stress response to increased water speed or due to different anaerobic metabolism ratio during swimming.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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