Abstract
It is important to secure evacuation space for fish during floods to create comfortable environment. Evacuation area includes wando, groyne and vegetation. Wando is a dead water region connecting the main current of a river. However, little is known about the relationship between evacuation behavior of fish and geometric shape of wando. In this study, an investigasion on evacuation behavior of Candidia temminckii was conducted under the condition that the direction of wando opening and also the flow velocity are changed. It was found that the low velocity area increased when wando opening was faced downstream, and this area became evacuation area for Candidia temminckii. Besides, it was shown that Candidia temminckii swim facing mainly the sidewall or downstream directions when the wando opening was faced downstream.
