Natal origin and migration pathways of Mekong catfish (Pangasius krempfi) using strontium isotopes and trace element concentrations in environmental water and otoliths

Type Article
Date 2021-06
Language English
Author(s) Tran Ngan TrongORCID1, Labonne Maylis2, Chung Ming-TsungORCID3, Wang Chia Hui4, Huang Kuo-Fang5, Durand Jean-Dominique2, Grudpan Chaiwut6, Chan Bunyeth7, Hoang Huy Duc1, Panfili Jacques2
Affiliation(s) 1 : Department of Ecology and Evolutionary Biology, University of Science, Ho Chi Minh City, Vietnam, Vietnam National University, Ho Chi Minh City, Vietnam
2 : IRD, MARBEC (Univ Montpellier, Ifremer, CNRS, IRD), Montpellier, France
3 : The University of Tokyo, Atmosphere and Ocean Research Institute, Tokyo, Japan
4 : Department of Environmental Biology and Fisheries Science, National Taiwan Ocean University, Keelung, Taiwan
5 : Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
6 : Department of Fishery, Faculty of Agriculture, Ubon Ratchathani University, Ubon Ratchathani, Thailand
7 : Wonders of the Mekong Project, Inland Fisheries Research and Development Institute, Fisheries Administration, Phnom Penh, Cambodia
Source Plos One (1932-6203) (Public Library of Science (PLoS)), 2021-06 , Vol. 16 , N. 6 , P. e0252769 (25p.)
DOI 10.1371/journal.pone.0252769
Abstract

To improve our knowledge of the migration pathway of a highly threatened fish species along the Mekong River, strontium isotope ratios (87Sr/86Sr) and 18 trace element concentrations were measured in the water and in the otoliths of an anadromous catfish, Pangasius krempfi, to infer its natal origin and potential migration pathways. Water was sampled at 18 locations along the mainstream, tributaries and distributaries of the Mekong River. To check for accuracy and precision, measurements of the 87Sr/86Sr ratios and trace element concentrations were then compared in two laboratories that use different analytical methods. Differences in trace element concentrations between locations were not significant and could not, therefore, be used to discriminate between migration pathways. However, the Mekong mainstream, tributaries and distributaries could all be discriminated using Sr isotopes. The 87Sr/86Sr profiles recorded in P. krempfi otoliths showed that there were three contingents with obligate freshwater hatching and variable spawning sites along the Mekong mainstream, from Phnom Penh (Cambodia) to Nong Khai (Thailand) or further. After hatching, the fish migrated more or less rapidly to the Mekong Delta and then settled for most of their lifetime in brackish water. Spawning habitats and migration routes may be threatened by habitat shifts and the increasing number of hydropower dams along the river, especially the contingents born above Khone Falls (Laos). The conservation of P. krempfi, as well as other migratory fish in the Mekong River, requires agreements, common actions and management by all countries along the Mekong River. This study highlighted the importance of using both Sr/Ca and 87Sr/86Sr ratios to understand life history of anadromous fishes as the 87Sr/86Sr ratio in the water was shown to be less effective than the Sr/Ca ratio in identifying movements between different saline areas

Full Text
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Publisher's official version 25 2 MB Open access
S1 Fig. Summary analysis process for trace element and 87Sr/86Sr in the water. 7 MB Open access
S2 Fig. Otolith of Pangasius krempfi. 4 MB Open access
S3 Fig. 11 MB Open access
S1 Table. Accuracy and precision of trace elemental analyses assessed using SRM 1640a reference material. 14 KB Open access
S2 Table. Trace element concentrations. 28 KB Open access
S3 Table. 87Sr/86Sr values in otoliths of Pangasius krempfi. 71 KB Open access
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How to cite 

Tran Ngan Trong, Labonne Maylis, Chung Ming-Tsung, Wang Chia Hui, Huang Kuo-Fang, Durand Jean-Dominique, Grudpan Chaiwut, Chan Bunyeth, Hoang Huy Duc, Panfili Jacques (2021). Natal origin and migration pathways of Mekong catfish (Pangasius krempfi) using strontium isotopes and trace element concentrations in environmental water and otoliths. Plos One, 16(6), e0252769 (25p.). Publisher's official version : https://doi.org/10.1371/journal.pone.0252769 , Open Access version : https://archimer.ifremer.fr/doc/00698/81052/