Inter-Research > MEPS > v700 > p161-178  
Marine Ecology Progress Series

via Mailchimp

MEPS 700:161-178 (2022)  -  DOI:

Otolith microchemistry reveals different environmental histories for two endangered fourfinger threadfin species

Zhongya Xuan1, Xuefeng Wang2, Sukree Hajisamae3, Karl W. K. Tsim4, Jian Yang5, Wen-Xiong Wang1,*

1School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, PR China
2College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, Guangdong, PR China
3Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
4Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China
5Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, PR China
*Corresponding author:

ABSTRACT: Many fishes inhabit different environments throughout ontogeny in order to utilize more suitable habitats and meet their growth needs during different developmental stages. Otolith microchemistry analysis is a powerful tool to elucidate the environmental histories and past movement patterns of fishes, providing important insights into the connectivity between various environments utilized by different developmental stages. In this study, we used laser ablation inductively coupled plasma mass spectrometry to analyze the chemical composition of otoliths throughout the entire lifetime of 2 endangered and closely related fourfinger threadfin species, Eleutheronema rhadinum and E. tetradactylum. This is the first study to reconstruct the life history of fourfinger threadfins, and the various element:Ca ratio profiles from otolith core-to-edge analysis suggest differences in environmental histories between the species, especially during their early life stages. We identified 2 contrasting environmental history patterns. Most of the analyzed E. rhadinum individuals were estuarine-dependent, with fish spending their first year in an estuarine environment and then moving to marine coastal systems. In contrast, the majority of E. tetradactylum individuals were coastal-dependent, remaining in the coastal systems throughout their early life history stages. Element:Ca profiles, self-organizing maps and random forest analysis also detected a unique environmental history pattern in early life history stages of the Thai E. rhadinum population that differed from the Chinese E. rhadinum population. There was no evidence of differences between E. tetradactylum populations from Thailand and China. Fourfinger threadfins have experienced drastic population declines over the past decade, and holistic management to increase environmental connectivity for these species is necessary to maintain sustainable fisheries.

KEY WORDS: Otolith · Life history · Threadfin fish · Endangered species · Environmental histories

Full text in pdf format
Cite this article as: Xuan Z, Wang X, Hajisamae S, Tsim KWK, Yang J, Wang WX (2022) Otolith microchemistry reveals different environmental histories for two endangered fourfinger threadfin species. Mar Ecol Prog Ser 700:161-178.

Export citation
Share:    Facebook - - linkedIn

 Previous article Next article