ISSN 1067-4136, Russian Journal of Ecology, 2007, Vol. 38, No. 4, pp. 292–294. © Pleiades Publishing, Ltd., 2007.
Original Russian Text © S.V. Gomboeva, N.M. Pronin, 2007, published in Ekologiya, 2007, Vol. 38, No. 4, pp. 314–316.
Published data on the contents of heavy metals
(HMs) in organs of ﬁsh from different water bodies,
including Lake Baikal, are usually presented without
their division by age groups (Gomboeva et al., 2003).
However, information on changes in the contents of
HMs during ﬁsh ontogeny is interesting both in terms
of age ecology and from the aspect of representative
sampling adequately reﬂecting distribution by age in
studies on seasonal dynamics of ﬁsh populations and
their long-term monitoring. The purpose of this study
was to determine the contents of HMs (Cu, Zn, Cd, Pb)
depending on age in a typical benthophage, the Sibe-
Rutilus rutilus lacustric
, and in an obligate
predator, the pike
in the Selenga Shoal of
The study was performed in Cherkalov
Sor Bay of Lake Baikal, which is in the southern part of
the Selenga foredelta, also known as the Selenga Shoal.
This shallow water body with a surface area of 3700 ha
is separated from Lake Baikal by a narrow sandy spit
cut by several channels. Tributaries of the Selenga delta
ﬂow into it. The samples of ﬁsh were taken from
catches made with nets and seines in July 2002. The
ﬁsh were measured, weighed, and their age was deter-
mined; thereafter, they were frozen and brought to the
laboratory. For analysis, pooled samples of organs (the
liver, gills, and skin) and tissues (muscles) were taken
from six ﬁsh of each age group. Altogether, 680 sam-
ples (340 from pike and 340 from roach) were assayed for
the contents of Cu, Zn, Cd, and Pb by the method of inver-
sion voltamperometry using the Analiz (version 2.02)
system of automatic voltamperometric analysis and a
PLS-2 polarograph (
GOST R 511301-99. Produkty…
1999). The results were processed by methods of vari-
ation statistics (Lakin, 1990). Data on individual ele-
ments are presented below.
The concentration of this metal in all
organs of ﬁsh sharply increases in the period of matura-
tion (at the age 3+ to 4+ in roach and 5+ to 6+ in pike)
and continues to increase at the age 7+ to 8+ (Fig. 1).
In general, the copper content in the skin, muscles, and
gills in both species changes synchronously, but this
content in the organs of pike of all age groups is consid-
erably lower than in roach of the corresponding ages.
The content of copper in the liver of roach and pike
shows no distinct dependence on age (Fig. 2): in matur-
ing roach (3+ to 4+), it remained at the same level
(12.63 mg/kg) as in younger ﬁsh (13.34 mg/kg) or older
ﬁsh (13.44 mg/kg).
The distribution of zinc in the organs and tissues
of roach is similar to that of copper. Its content reaches a
maximum in the muscles (8.04–12.97 mg/kg) and
decreases to a minimum in the gills (25.78–50.26 mg/kg).
The total concentration of zinc is higher than that of
copper. In pike, it is the highest in the skin rather than
in the gills (Fig. 1). In older ﬁsh, the content of zinc in
the gills and skin increases similarly to that of copper
= 0.92): in the gills of roach, to 50.23 mg/kg (twofold);
in the skin of pike, to 53.75 mg/kg (more than twofold).
The distribution of lead in the muscles, skin,
and gills of roach and pike is generally similar to that of
copper in the same organs, with the lowest concentra-
tion in muscles and the highest concentration in the
gills. Similarly to roach, the concentration of lead in
pike increases with age (Fig. 1). It should be noted that
the distribution of lead only in the ﬁsh liver fully coin-
cides with other organs.
Age-Related Changes in the Contents of Heavy Metals
(Cu, Zn, Cd, Pb) in Organs and Tissues of Siberian
Roach and Pike in the Selenga Shoals, Lake Baikal
S. V. Gomboeva
and N. M. Pronin
East Siberian State Technological University, ul. Klyuchevskaya 40v, Ulan-Ude, 670013 Russia;
Institute of General and Experimental Biology, Siberian Division, Russian Academy of Sciences,
ul. Sakhyanovoi 6, Ulan-Ude, 670047 Russia;
Received April 17, 2006
: heavy metals, ﬁsh, Lake Baikal, MAC.