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The Bothnian Sea which is located between Finland and Sweden represents an important source of fresh water to the Baltic Sea. We here present new data on the radioactive isotope I species from water samples collected in December 2009 at different depths in the Bothnian Sea. Concentrations of I (iodide) in the Bothnian Sea range from 14 × 10 to 32 × 10 atoms/L, while IO (iodate) concentrations are relatively low and fluctuating at 1 × 10 atoms/L. For nutrients data determined in the same samples as I, significant correlations could be found between I and total P, NO-N, SiO-Si, but rather poor with NH-N. The correlations suggest comparable source pathway of I and nutrient parameters, while the source of NH-N may be different. The small amounts and negligible change of IO indicate prevailing extensive reduction of iodate in the Baltic Sea. [ABSTRACT FROM AUTHOR]