Influence of Deionized Water on Blood Glucose and Plasma Sodium Ion Concentration in Young Salmon: (Salmo salar L.)
AbstractArchives Internativnales de Physiolvgie et de Bivchimie, 1971,19, 185-792 785 Requ le 16 aoGt 1971. INFLUENCE OF DEIONIZED WATER ON BLOOD GLUCOSE AND PLASMA SODIUM ION CONCENTRATION IN YOUNG SALMON (Sulrno salur L.) BY Eva BERGSTROM ('f (Salmon Research Institute, k'lvkarfeo, Sweden) (1 figure) INTRODUCTION Prolonged treatment with continually renewed distilled water is known to decrease the sodium content of the blood plasma of freshwater Fishes (KROGH,1937). While investigating the influence of deionized water on the blood chemistry of young hatchery reared salmon I observed such a decrease in plasma sodium but, in addition to this, a marked increase in the blood glucose content. These changes were observed at different times of the year. MATERIAL D A N METHODS %Ire experiments were carried out at the laboratory of the Swedish Salmon Research Institute on two-summer-old hatchery reared salmon of Lule river stock in August 1969, October-November 1969, and January 1970. The fish were kept in well aerated deionized water in a small Perspex tank, using about 1 liter of water per fish. By means of an all plastic pump (Eheim) the water was recirculated all the time through a Barnstead Bantam demineralizer with a standard (Blue cap) cartridge.