Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Ik Joon KANG Last modified date:2020.01.23

Associate Professor / School of Interdisciplinary Science and Innovation


Presentations
1. Ik Joon KANG, Yohei Shimasaki, Y. Ueno, Xuchun Qiu, Yuji Oshima , Alternation of sound production in Japanese medaka, Oryzias latipes exposed to environmental toxicants, 19th International Symposium on Toxicity Assessment, 2019.08, We previously reported that the Japanese medaka (Oryzias latipes) is a sonic fish and produces stable sounds on a regular basis (average interpulse intervals; approx 0.2 s) under normal conditions. In this study, we investigated the responses of sound production, such as the number and interpulse intervals of sound production, to various environmental toxicants. If abnormal changes in sound production were linked with toxic chemical exposure, we would consider to extend this monitoring method to the application of biological monitoring for water quality.
We conducted three different kinds of exposure test with the carbamate insecticide (aldicarb), heavy-metal compound (copper sulfate) and benzodiazepine pharmaceutical (diazepam). In aldicarb and copper sulfate exposure test, fish were exposed at four concentrations (aldicarb: 0, 0.25, 0.5, and 1 mg/L; copper sulfate: 0, 0.5, 1, and 2 mg/L), and sound characteristics were monitored for 5 hours after exposure. The nominal concentrations of diazepam (0, 0.01, 0.03, 0.1, 0.3, 1 and 3 mg/L) for 48 hours exposure test was selected on the basis of the results of the preliminary toxicity test. After the exposure tests, we analyzed the number and interpulse interval of sound in medaka fish.
In aldicarb exposure test, the average interpulse interval was significantly longer and reached a length of more than 0.3 s during the recording periods. In copper exposure test, most medaka fish stopped to produce sound at 1 mg/L and 2 mg/L, resulting in significantly declined number of sound pulses. Relatively shortened interpulse intervals of sound production were observed in medaka fish exposed to 0.5 mg/L copper sulfate. Exposure to diazepam induced the significant declined number of sound pulses in 0.3, 1 and 3 mg/L groups. However, we found no notable change in interpulse intervals of sound in medaka fish exposed to diazepam.
From these results, it was suggested that monitoring the acoustic alternations of Japanese medaka has potential to detect water accidents in water resources. It can be concluded that further studies should be done concerning toxic chemicals at environmentally relevant levels on sound production in medaka fish to facilitate the application of sound production in water-quality monitoring and early warning systems..
2. Toshihiro Horiguchi, Keita Kodama, Gen Kume, Ik Joon KANG, K. Kawamura, Y, Ohta , Consecutive sexual maturation in the rock shell, Thais clavigera collected at a site near the Fukushima Daiichi Nuclear Power Plant, 19th International Symposium on Toxicity Assessment, 2019.08.
3. Toshihiro Horiguchi, Keita Kodama, Gen Kume, Ik Joon KANG, Delayed recovery from declines in the population densities and species richness of intertidal invertebrates near the Fukushima Daiichi Nuclear Power Plant, 15th Biennial Conference of the South Pacific Environmental Radioactivity Association (SPERA), 2018.11.
4. Ik Joon KANG, Xuchun Qiu, Yuji Oshima, Sound production by Japanese medaka (Oryzias latipes) and its alteration by exposure to aldicarb and copper sulfate. , International Symposium Fisheries Science for the Future Generations, 2017.09.
5. Toshihiro Horiguchi, Keita Kodama, Gen Kume, Ik Joon KANG, Less recovery from decline in intertidal biota around Fukushima Daiichi Nuclear Power Plant, 4th International Conference on Radioecology and Environmental Radioactivity (ICRER), 2017.09.
6. Rumana Tasmin, Yohei Shimasaki, Michito Tsuyama, Xuchun Qiu, Fatma Khalil, Ik Joon KANG, Yuji Oshima, Effects of two herbicides (thiobencarb and DCMU) on fresh water green algae, Pseudokirchneriella subcapitata (NIES-35) under various water temperatures, Society of Environmental Toxicology and Chemistry (SETAC) Asia Pacific 2012, 2012.11.
7. Masato Honda, Hiroaki Gunjikake, S Matsui, Ik Joon KANG, Yohei Shimasaki, Yuji Oshima, Effect of repeated exposure to low-oxygen on respiratory metabolism and vertical movement of the pen shell Atrina lischkeana, Society of Environmental Toxicology and Chemistry (SETAC) Asia Pacific 2012, 2012.11.