| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
|
|---|
| Outline of Final Research Achievements |
The Mekong giant catfish (Pangasianodon gigas) is one of the largest freshwater fish, measuring up to 3 m in total length and weighing more than 300 kg. This wild species is endangered. The Department of Fisheries, Thailand has released hatchery-reared juveniles into waterbodies, including reservoirs for stock enhancement in Thailand. In this study we monitored movements and horizontal distribution of juvenile Mekong giant catfish using acoustic telemetry, and tried to determine food sources used by the catfish using carbon and nitrogen stable isotopes. Most of the tagged juvenile catfish were distributed throughout the reservoir within one month after their release, and then their movement ranges became limited. The movements, possibly concerning feeding behaviour, of the larger juvenile catfish near the dam were detected. The carbon and nitrogen stable isotopes analyses provided the trophic interaction in the reservoir.
|
