Dorso-ventral line scans of otoliths of <1-year-old Dolly Varden show non-uniform Sr and Zn distributions. It is suggested that the high central Sr is a maternal signal, and that the lower outer Sr is due to exogenous feeding and reflects the fishs' riverine environment. The outer Sr is heterogeneous on the scale of a few microns, presumably due to variations caused by daily feeding. Rastering the proton beam over a 60 μm2 area gives good agreement between Sr concentrations in the dorsal and ventral regions. This work has made significant progress towards use of otolith Sr concentrations within the first annular growth increment as a potential stock identifier.
|Number of pages||5|
|Journal||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Publication status||Published - Apr 1 2002|
- Stock discrimination
ASJC Scopus subject areas
- Nuclear and High Energy Physics