Acid-base Regulation following Exhaustive Exercise: a Comparison between Freshwater- and Sea Water-adapted Rainbow Trout (salmo Gairdneri)
نویسنده
چکیده
Blood acid-base regulation following exhaustive exercise was investigated in freshwater(FW) and seawater(SW) adapted rainbow trout (Salmo gairdneri) of the same genetic stock. Following exhaustive exercise at 10°C, both FW and SW trout displayed a mixed respiratory and metabolic blood acidosis. However, in FW trout the acidosis was about double that of SW trout and arterial blood pH took twice as long to correct. These SW/FW differences were related to the relative amounts of net H + equivalent excretion to the environmental water, SW trout excreting five times as much as FW trout. The greater F£ equivalent excretion in SW trout may be secondary to changes in the gills that accompany the adaptation from FW to SW. It may also be related to the higher concentrations of HCO3" as well as other exchangeable counter-ions (Na and CP) in the external medium in SW compared to FW.
منابع مشابه
White Muscle Intracellular Acid-base and Lactate Status following Exhaustive Exercise: a Comparison between Freshwater- and Sea Water- Adapted Rainbow Trout
The intracellular acid-base status of white muscle of freshwater (FW) and seawater (SW) -adapted rainbow trout was examined before and after exhaustive exercise. Exhaustive exercise resulted in a pronounced intracellular acidosis with a greater pH drop in SW (0.82 pH units) than in FW (0.66 pH units) trout; this was accompanied by a marked rise in intracellular lactate levels, with more pronoun...
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