Kłyszejko B., 1973. Osmotic changes in the blood serum of the pike Esox lucius L. during the process of adaptation to the increased salinity of water. Acta Ichthyol. Piscat. 3 (1): 125-137.
Osmotic properties (osmotic pressure and concentration of Na+, K+ and Ca++) of the blood serum of the pike Esox lucius L. were studied in natural environments of various salinity (Lake Dąbie - fresh water; Szczecin Bay - 0,4 -1,2 per thousand salinity; Pomeranian Bay -5,4 - 8,6 per thousand salinity) and in synthetic sea water of a salinity of 2, 7, 12, 13, 14, and 16 per thousand.