Acoustic Telemetry Monitors Movements of Wild Adult Catfishes in the Mekong River, Thailand and Laos

Abstract

Research on fish movement and habitat use in large tropical rivers is urgently needed to protect fisheries that are a primary source of protein for millions of people. In this pilot study, acoustic telemetry was used to monitor movements of wild catfishes in a 94.6 rkm reach of Mekong River, where it functions as the border between Thailand and Lao People’s Democratic Republic (PDR). Twenty fish were tagged and released in May 2006 and monitored through May 2007 with 17 fixed-site acoustic receivers. Ten receivers had detection probabilities ranging from 0.67 to 1.00, and five receivers had detection probabilities of 0.50 or less. Detection probability was not correlated with river width. Eighteen (90%) of the tagged fish were detected by at least one receiver. Monitoring durations of individual fish ranged from 0.1 to 354.4 days. The longest total movement was 88.3 rkm, while the longest upstream movement was 52.1 rkm. Movement rates ranged from 0.1 to 156.7 rkm/d. This work provided preliminary data on movement patterns of wild Mekong catfishes. The methods and lessons learned from this study can be used for future positional telemetry research to address management-relevant uncertainties about migration corridors, habitat use, efficacy of fish reserves, and river development planning.

Bivalve molluscs as biosensors of water quality: state of the art and future directions

“…Meese & Lowe, 2020). However, acoustic telemetry applications typically use aquatic life whose movements are of far greater magnitude, and over a far wider geographical range, than those in question (Leclercq et al, 2018;Naughton et al, 2021;Nebiolo & Meyer, 2021). Bivalve motions lie on the scale of < 1 to 10 s of centimetres per day (Amyot & Downing, 1997;Gough et al, 2012;Mitchell et al, 2018), and since positional accuracy of acoustic telemetry typically falls above this scale (e.g.…”