LEAD AND CADMIUM ACCUMULATION IN SILVER CARP
N. I. Hradovych1, R. P. Paraniak1, Yu. M. Zabytivskyi2
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1Lviv National University of Veterinary Medicine and Biotechnologies named after S. Z. Gzhytskyj,
50 Pekarska st., Lviv 79010, Ukraine
2Lviv research station of Institute of fisheries NAAS,
11 Lvivska str., Velykyi Lyubin, Horodok district, Lviv region 81555, Ukraine
The features of the dynamics of Lead and Cadmium contents in organs and tissues 1- and 2-year silver carp (Hypophthalmichthys molitrix Valenciennes, 1844) during the vegetation period in fish-breeding ponds at the Lviv research station of Institute of fisheries NAAS (Lviv region, Horodok district, Velykyi Lyubin) are studied. The seasonal and age dependences of lead and cadmium in silver carp are investigated.
It is shown that with background content of these metals in water the most intensive Cadmium accumulation is in tissue 1-year silver carps comparatively to 2-year individual. Total content of this element in muscle tissue of 2-year silver carp after vegetation periods is 34 % higher but intensity of this accumulation during these periods is lower. The seasonal algorithm of Cadmium accumulation in 1- and 2-year silver carps is analogous and they decrease in series: kidney>gills>liver>muscle>blood. The exception is spring period when the Cadmium accumulation in liver is higher than in gills. A little different accumulation character of Lead in organism 1-yaer silver carp is shown. During spring-summer vegetation periods the descending line: kidney>gills>muscle>liver>blood is reflected. In 2-year silver carp during this period index of Lead accumulation decreases in line: gills>kidney>liver>muscle>blood. It is shown the highest inclination for Lead accumulation compared to Cadmium in muscles of 2-year fishes in conditions for content of these metals in water in accordance with fisheries limit concentrations.
Keywords: CADMIUM, LEAD, SILVER CARP, ORGANS, TISSUE
