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- Title
Coexistence of anadromous and lacustrine life histories of the shirauo, Salangichthys microdon.
- Authors
Arai, T.; Hayano, H.; Asami, H.; Miyazaki, N.
- Abstract
Abstract The environmental history of the shirauo, Salangichthys microdon , was examined in terms of strontium (Sr) and calcium (Ca) uptake in the otolith, by means of wavelength dispersive X-ray spectrometry on an electron microprobe. Anadromous and lacustrine type of the shirauo were found to occur sympatric. Otolith Sr concentration or Sr : Ca ratios of anadromous shirauo fluctuated strongly along the life-history transect in accordance with the migration (habitat) pattern from sea to freshwater. In contrast, the Sr concentration or the Sr : Ca ratios of lacustrine shirauo remained at consistently low levels throughout the otolith. The higher ratios in anadromous shirauo, in the otolith region from the core to 90–230 μm, corresponded to the initial sea-going period, probably reflecting the ambient salinity or the seawater–freshwater gradient in Sr concentration. The findings clearly indicated that otolith Sr : Ca ratios reflected individual life histories, enabling these anadromous shirauo to be distinguished from lacustrine shirauo.
- Subjects
ANADROMOUS fishes; STRONTIUM; CALCIUM; ELECTRON probe microanalysis
- Publication
Fisheries Oceanography, 2003, Vol 12, Issue 2, p134
- ISSN
1054-6006
- Publication type
Article
- DOI
10.1046/j.1365-2419.2003.00226.x