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The activity of sodium excreting cells in the gills of gorbuscha and keta adapting to life in sea water

The activity of sodium excreting cells in the gills of gorbuscha and keta adapting to life in sea water

Vopr Ikhtiol 2(4): 687-692

Histo-chemical assays were conducted on fingerlings, 31-35 mm long, 300-400 mg, of Oncorhynchus gorbuscha Walb and Oncorhynchus keta Walb., raised from eggs in aquaria (10-12[degree] C, aeration). Succinic dehydrogenase activity, as reflected in the rate of degradation of succinic acid, was assayed according to the method of Shelton and Shneider (?). It was found that the mitochondrial activity was greatest in the mitochondria of the circular cells lying at the base of, or between the gill filaments. Mitochondrial activity was considerably greater in salt water than in fresh water. Fresh water acclimatized fingerlings placed in salt water adjusted immediately (1 death), with the first measurable effects of succinic dehydrogenase activity recorded after 3 hours, and thereafter considerably increasing during rest of a 24-hour period. Salt water acclimatized fingerlings adjusted immediately when placed in fresh water, but showed only weak succinic-dehydrogenase activity, and only after 12 hours. The existence of a reflexive system instantaneously reactant and consisting of effector cells able to excrete or take up sodium depending on the tonicity of the external environment is suggested.

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