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Swimming experiments of wild pale chub (Zacco platypus) were carried out by installing a stamina tunnel in a fishway in the river. The burst speed of individual fish that swam for 1-5 seconds and the maximum instantaneous burst speed of individual fish that swam 50 cm distance at a maximum speed were investigated. The results show: (1) the average burst speed of a pale chub, which is when the fish swims at a speed of at least 10 times its own body length per second for a period of one to five seconds, was 27 times body length per second on average; (2) the burst speed and the maximum instantaneous burst speed were calculated for fish with a body length of about 6 cm to about 10 cm in conditions of a high velocity (185cm/s), and the results were: mean burst speed: 230 cm/sec (σ=±15 cm/s), mean swimming time: 4.86 s (σ=±1.60s), maximum instantaneous burst speed: 268cm/s (σ=±37cm/s), mean swimming time: 0.80s (σ=±0.50 s).

ON-SITE SWIMMING EXPERIMENT OF BURST SPEED OF PALE CHUB WITH A STAMINA TUNNEL USING NATURAL RIVER DOWN-FLOW WATER