Joon Gu Kang, Jong Tae Kim, Hong Koo Yeo
Friday 3 july 2015
12:54 - 12:57h at Oceania (level 0)
Themes: (T) Hydro-environment, (ST) Ecohydraulics and ecohydrology, Poster pitches
Parallel session: Poster pitches: 15K. Deltas - Wetland
Acoustics is an important factor for environments for fish and human habitats. Artificial river environments keep changing the natural stream sounds and there is a need to identify attracting sounds for fish, which can be obtained from hydraulic structures. In order to analyze preference and avoidance sound for fish in this study, field survey was conducted to measure sound and hydraulic characteristics in streams. Behavior tests of fish using specific sounds were also conducted in a small scale channel. The goal of this study is to develop an attracting acoustic system and a fish barrier for an eco-friendly technique. The experiments were conducted to investigate fish responses to barrier structure types. We obtained sound sources of specific fish response and confirmed the possibility of the technique to develop a sound barrier. Firstly, the responses of fish (bass, bluegill, carp, bitterling) to the sound frequency were tested. Secondly, the sensitivity of fish behavior on sound range and pressure also was tested in the experiments. Fish responses to the sound are observed to be difference depending on fish species. The sensitivity test of fish behavior on sound range and pressure shows that bitterling > carp > bluegill > bass. For most fish species, the critical sound pressure of fish response is over 140 dB.