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New Insights into Fish Ecology via Nuclear Microscopy of Otoliths

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Author

Summary, in English

Otoliths, or earstones, are small, biogenic concretions of aragonitic calcium carbonate precipitated on a protein matrix. Otoliths form part of the hearing and balance system in teleost fishes, and grow as the fish grow, providing a continuous biochronology of growth. Various elements are entrained in minor and trace quantities. In particular, strontium is a useful scalar of habitat use when variable environmental gradients exist. By mapping elemental concentrations and ratios with the Lund nuclear microprobe, we have used strontium in many cases as a proxy for salinity, because Sr:Ca values are roughly an order of magnitude higher in marine vs most fresh waters. In addition, zinc shows strong seasonal variations in salmoniform fishes (salmons, charrs, and whitefishes have been tested to date). We present case studies of several species, and discuss exciting future directions in this research that is revolutionizing fisheries ecology. ©2003 American Institute of Physics

Department/s

Publishing year

2003

Language

English

Pages

339-342

Publication/Series

AIP Conf. Proc. -- August 26, 2003

Volume

680

Document type

Conference paper

Publisher

American Institute of Physics (AIP)

Topic

  • Subatomic Physics

Status

Published

Research group

  • Nuclear Microprobe