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Diverse migration tactics of fishes within the large tropical Mekong River system

An V. VuGulbali Institute, Charles Sturt University Albury New South Wales AustraliaLee J. BaumgartnerGulbali Institute, Charles Sturt University Albury New South Wales AustraliaMartin Mallen‐CooperFishway Consulting Services St Ives Chase New South Wales AustraliaGregory DoranGulbali Institute, Charles Sturt University Albury New South Wales AustraliaKarin E. LimburgCollege of Environmental Science and Forestry State University of New York Syracuse New York USABronwyn M. GillandersSouthern Seas Ecology Laboratories and the Environment Institute, School of Biological Sciences The University of Adelaide Adelaide South Australia AustraliaJason D. ThiemDepartment of Primary Industries Narrandera Fisheries Centre Narrandera New South Wales AustraliaJulia HowittGulbali Institute, Charles Sturt University Albury New South Wales AustraliaCameron M. KewishAustralian Synchrotron Clayton Victoria AustraliaJuliane ReinhardtAdvanced Light Source Lawrence Berkeley National Laboratory Berkeley California USAI. G. CowxHull International Fisheries Institute University of Hull Hull UK

2022en

ABI

Annotatsiya

Abstract Fish often migrate to feed, reproduce and seek refuge from predators and prevailing environmental conditions. As a result, migration tactics often vary among species based on a diversity of life history needs, although variation within species is increasingly being recognised as important to population resilience. In this study, within‐ and among‐species diversity in life history migratory tactics of six Mekong fish genera was examined using otolith microchemistry to explore diadromous and potamodromous traits. Two species were catadromous and one species was an estuarine resident, while the remaining three species were facultative in their migration strategies, with up to four tactics within a single species. Migrant and resident contingents co‐existed within the same species. Management, conservation and mitigation strategies that maintain connectivity in large tropical rivers, such as effective fishway design, should consider a diversity of migration tactics at the individual level for improved outcomes.

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DOI: 10.1111/fme.12566

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