The aim of this study was to determine concentrations of Na, K, Mg, Ca, P, Zn and Fe in the
meat of ruffe (Gymnocephalus cernua L.) and to investigate the relationship between fish sex or
age and the mineral content of fish meat. 90 individuals of ruffe were caught in autumn (from
October 9 to November 6) from the Vistula River, near Toruń and he local wastewater treatment
plant. The muscle tissues from the large side muscle in a fish body, above the lateral line,
were taken for analyses. All frozen meat samples were freeze dried in a freeze dryer and then
tissues were mineralized in a microwave mineralizer. Concentrations of minerals were determined
by flame atomic absorption spectroscopy. As the analyses indicated, the concentrations of
macroelements were arranged in the order: K > Ca > P > Na > Mg and the content of microelements
was noted in the following decreasing sequence: Zn > Fe. The ranges of the mean concentrations
of Na, K, Mg, Ca and P (g kg-1) were as follows: from 2.38 to 2.68, from 14.74 to 16.16,
from 1.47 to 1.60, from 5.63 to 8.06, from 2.18 to 3.59, respectively. The ranges of the mean
concentration of microelements (mg kg-1) were from 49 to 74 for Zn and from 26 to 29 for Fe.
Statistically significant relationships between the age and the macro- and microelement concentrations
were verified, and this tendency was comparable to the data obtained by other authors.
Results of these studies showed that the sex of ruffe was not an important factor for the levels
of macro- and microelements in this species.
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