Comparative-morphological characteristics of spleen of the perch Perca fluviatilis L. from lakes with different water pH level

Quantitative composition of leukocytes and structure of spleen of the perch Perca fluviatilis L. from water reservoirs with different pH and color of water were studied. Changes of proportion of lymphocytes, macrophages, and band neutrophils are shown in fish from reservoirs with different pH level. Two types of small blood vessels are revealed and changes of their structure are described: thickening of the connective tissue layer, the appearance of fibroblast-like cells, an increase of folding of the basal part of the endotheliocyte membrane. Probable association of the revealed changes with pH level in the water reservoirs and their hydrochemical conditions is discussed.Translated from Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, Vol. 41, No. 1, 2005, pp. 89–94.Original Russian Text Copyright © 2005 by Zabotkina.