title: [Exogenous Sr2+ sedimentation on otolith of chum salmon embryos].
abstract: To explore the exogenous Sr2+ sedimentation on otolith of chum salmon embryos, chum salmon embryos were exposed to culture water contained Sr2+ at Sr2+ concentration of 50, 100, 200 or 400 mg . L-1 for 48 h to imitate Sr2+ sedimentation. After a culturing period of 12 d and 100 d, the otoliths of the chum salmon were taken to detect exogenous Sr2+ sedimentation with electro-probe microanalyzer (EPMA). The results showed that obvious deep red strontium signatures were produced in the otolith of chum salmon at different concentrations of Sr2+. The mean and extreme values of peak strontium area were not stable for the same Sr2+ dose, but the lowest of all the peak values was 35.1 times as much as that of control. Overall, the strontium value increased with the increase of Sr2+concentration. The strontium peak had no signs of abating after a culture period of 100 d. The results also showed that strontium was gradually deposited in the otolith, and had obvious hysteresis to immersion. Strontium sedimentation could also return to a normal level after the peak. These characteristics accorded exactly with the requirement of discharge tag technology, which indicated that exogenous Sr2+ was suitable in the marking of salmon otolith.
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Pei-rong
authors.initials: PR
authors.lastname: Zhan
authors.forename: Ji-long
authors.initials: JL
authors.lastname: Wang
authors.forename: Pei-lun
authors.initials: PL
authors.lastname: Li
mesh_terms: D000818:Animals; D017685:Oncorhynchus keta / Q000196:embryology*; D010037:Otolithic Membrane / Q000737:chemistry*; D013324:Strontium / Q000032:analysis*
chemical_list: D013324:Strontium