Mekong Giant Catfish Tracking Project
|Mekong giant catfish Pangasianodon gigas is endemic to the Mekong River. The catfish is one of the largest freshwater fish in the world, measuring up to 3 m in length and weighing in excess of 300 kg. Historically, the catfish was distributed throughout the Mekong River basin from Yunnan Provice, China to Vietnam. Currently, the catfish seems to be limited to the Mekong River and its tributaries in Thailand, Laos and Cambodia. In Thailand, the number of the wild catfish captured in the Mekong River has decreased due to the development of the Mekong River and indiscriminate fishing these days. Therefore, ecological researches are urgently necessary to conserve the catfish. The objective of this study was to clarify the migratory behavior of the Mekong giant catfish in the Mekong River cooperated with the Department of Fisheries, Thai government.||
used an ultrasonic coded transmitter (V16-4H, Vemco Co. Ltd., Canada) that
was 16 mm in diameter, 65mm long, and weighed 10 g in water. The transmitter
was used to transmit complex codes of up to six pulses. We can identify up
to 256 different fishes on the same frequency.
In this study, we found that the Mekong giant catfish tended to migrate upward in the Mekong River. However, the important questions, gwhy do they migrate upward?h and gDoes the wild Mekong giant catfish also migrate upward?h remain to be answered.