Misidentification of the migratory history of anguillid eels by Sr/Ca ratios of vaterite otoliths
Journal
Marine Ecology Progress Series
Journal Volume
348
Pages
285-295
Date Issued
2007
Author(s)
Tzeng, Wann-Nian
Tzeng, Wann-Nian
Chang, Chih-Wei
Wang, Chia-Hui
Iizuka, Yoshiyuki
Yang, Yi-Jung
Yang, Yi-Jung
You, Chen-Feng
Lozys, Linas
Lozys, Linas
Abstract
Most fish otoliths are composed of aragonite, but occasionally they form a mosaic with its polymorph, vaterite. We found an unusual mosaic structure of extremely low strontium to calcium (Sr/Ca) ratio in the aragonite otoliths of European eels Anguilla anguilla. The mosaic crystal structure in the eel otolith appeared opaque under reflected light after EDTA etching and was confirmed to be a vaterite crystal by Raman spectroscopy. Analysis by laser ablation inductively coupled plasma mass spectrometry indicated that the elements sodium (Na), strontium (Sr) and barium (Ba) were lower in abundance and magnesium (Mg) and manganese (Mn) were higher in the vaterite than in the aragonite. Otoliths with vaterite inclusions were found in 48.1% of the 108 eels examined. If the mosaic vaterite in otoliths is not identified and avoided, the migratory environmental history of fish could be misidentified when otolith elemental signatures are used as biological tracers.
SDGs
Type
journal article