Salinities, not diets, affect strontium/calcium ratios in otoliths of Anguilla japonica
Resource
Journal of Experimental Marine Biology and Ecology 341 (2): 254-263
Journal
Journal of Experimental Marine Biology and Ecology
Pages
254-263
Date Issued
2007
Date
2007
Author(s)
Lin, Shih-Huan
Chang, Chih-Wei
Iizuka, Yoshiyuki
Tzeng, Wann-Nian
Abstract
Although otolith Strontium (Sr)/calcium (Ca) ratios have been widely used to reconstruct the past salinity environmental history of anguillid eels, factors affecting the Sr/Ca ratios in otoliths are incompletely understood. Japanese Eel (Anguilla japonica) elvers (mean length 54.7 ± 2.1 mm) were collected in the estuary during their upstream migration and reared at 5 different salinities (0, 5, 15, 25, and 35 psu) and 3 types of feeding conditions (formulated feed, tubifex, and starvation) for 30 days to evaluate the effects of salinity and diets on otolith Sr/Ca ratios. Ca and Sr concentrations in the ambient water significantly increased with salinity (SAL) as [Ca] water = 15.50SAL - 5.56, and [Sr] water = 0.21SAL + 0.03, respectively. Sr/Ca ratios in otoliths increased with salinity (SAL) of the rearing water as [(Sr/Ca) × 1000] otolith = 0.091SAL + 3.790. In diets, Sr/Ca ratios were 4 times higher in tubifex than in formulated feed. However, in otoliths, ANOVA indicated that Sr/Ca ratios did not differ significantly between groups fed on tubifex or formulated feed (p = 0.118). Otolith Sr/Ca ratios were negatively correlated with fish growth rates while the growth rates differed significantly among rearing conditions with different salinities and diets. Partition coefficients of the Sr/Ca ratios from ambient water to fish tissues and otoliths significantly increased with salinity. The Sr/Ca ratios of Japanese Eel otoliths thus were positively correlated with the ambient salinity and decreased with increasing fish growth rate, but was not affected by fish diet. © 2006 Elsevier B.V. All rights reserved.
SDGs
File(s)![Thumbnail Image]()
Loading...
Name
52.pdf
Size
408.51 KB
Format
Adobe PDF
Checksum
(MD5):f012978f161a6aebd0f09b28f837c7a1