Movements and horizontal distribution of hatchery-reared, one-year-old Mekong giant catfish <I>Pangasianodon gigas</I> by acoustic telemetry in Kaeng Krachan Reservoir, Thailand

Yokoyama Ayako, Arai Nobuaki, Mitamura Hiromichi, Nishizawa Hideaki, Mitsunaga Yasushi, Yamane Hiroyuki, Thavee Viputhanumas

doi:10.11233/aquaculturesci.69.237

The Mekong giant catfish Pangasianodon gigas is distributed in Southeast Asia and one of the largest freshwater fish in the world. Due to river basin development and overfishing, the catfish is endangered at present. In Thailand, zero- and one-year-old hatchery-reared juveniles have been released into local reservoirs for more than 30 years for stock enhancement. However, their habitat use and movement patterns after the release have been poorly understood even though such knowledge would contribute to their successful stock enhancement. In addition to our previous acoustic telemetry study on the habitat use and movement patterns of zero-year-old Mekong giant catfish, in this study we studied habitat use and movement patterns of four hatchery-reared, one-year-old catfish by acoustic telemetry in Kaeng Krachan Reservoir, Thailand. The objective of the paper is to describe the movement, horizontal distribution, and diel movement of the tagged fish. We succeeded in monitoring the tagged fish for 57, 24, 350, and 12 days, respectively. Three of the four tagged catfish possibly died from unknown causes or were unintentionally captured (bycatch) by fishermen during the experiment. The tagged catfish utilized almost the entire reservoir after their release, and then the horizontal utilization area gradually decreased. No significant diel horizontal movements were observed. These movement patterns were similar to those of zero-year-old catfish. These findings are important for their successful stock enhancement, and further comprehensive studies using a larger number of the tagged catfish are imperative in the near future.

Movements and horizontal distribution of hatchery-reared, one-year-old Mekong giant catfish <I>Pangasianodon gigas</I> by acoustic telemetry in Kaeng Krachan Reservoir, Thailand

Bibliographic Information

Search this article

Abstract

Journal

Keywords

Details 詳細情報について

Export

Report a problem