Abstract
Fish can migrate through fishways, when the velocity in fishways is smaller than fish's burst speed. The burst speed depends on fish species, body length and flow velocity. Although, there is little information on burst speed, it is known that the burst speed is nearly estimated as ten times of body length. This study discusses the burst speed of several fish species, i.e., Plecoglossus altivelis altivelis, Zacco platypus, Zacco temminckii and Carassius gibelio langsdorfi, in flowing water. A new formula and its coefficients which can be evaluated the burst speed on the basis fish species, body length and flow velocity are suggested. Further, the approach time and its distance to the burst speed are also made clear.
