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Specifics of ion regulation of the perch perca fluviatilis percidae in connection with the problem of the acidification of reservoirs


, : Specifics of ion regulation of the perch perca fluviatilis percidae in connection with the problem of the acidification of reservoirs. Voprosy Ikhtiologii 25(1): 137-144

The effect of cation composition of the environment on ammonium excretion was studied in the perch from Rybinsk Reservoir, Russian SFSR, USSR, in early ontogenesis stages, as were the features of ion regulation of the perch, which made it possible for the fish to live in acid weakly-mineralized reservoirs unsuitable for the existence of other fish species. The membrane of perch eggs was permeable for ions only in the 1st hours after fertilization. The larval stage was the most sensitive to environmental acidification. The protective action of Ca2+ ions manifested itself before hatching. The mineral composition did not affect the length of egg development. Low values of pH delayed hatching. The perch from the reservoir and acid lakes did not differ in resistance to decreased pH. The systems that maintained ion homeostasis and acid-base balance in the perch from the neutral and acid reservoirs functioned at various pH of the environment similarly. Presumably, the differences between the 2 populations were phenotypical. The high acid sensitivity of the perch was determined by the low sensitivity of the mineral metabolism of gills and their permeability to ions due to the increased environmental acidity.

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