[Biological variability and accuracy in determining macro- and microelements in fish].

The statistical analysis of 911 personal observations and literature findings on the mean content of ash, sodium, potassium, calcium, magnesium, iron, zinc, copper and manganese in different species of fish has brought to the conclusion on the absence of any reliable interspecies differences in the content of macro- and trace elements in fish muscle tissue (except for sodium and zinc). The evaluation of the analytical accuracy in the assessment and biological variability of the mineral composition of the fish muscles has shown that the values of both these components are comparable and should be taken into account in the development of new tables on the chemical composition of food products.