Effects Of Fluctuating And Constant Temperatures On Some Hematological Characteristics Tissue Glycogen Levels And Growth Of Steelhead Trout Salmo Gairdneri

Author : Daniel Peter Toews
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (143 download)

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Download or read book The Effect of Cycling Temperatures on Electrolyte Balance in Skeletal Muscle and Plasma of Rainbow Trout, Salmo Gairdneri written by Daniel Peter Toews and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract. The physiological effect of cycling temperatures on electrolyte balance in skeletal muscle and plasma of 1% - year-old rainbow trout ( Salmo gairdneri ) was studiedc The "cycling fish" were maintained in a large tank in which the water temperature cycled from S^C to 18°C daily, closely simulating daily temperature conditions in several Alberta mountain streams. After 42 days of exposure to the cycle, the fish were sampled at various temperatures. Muscle and plasma samples were analyzed for sodium, potassium, chloride, and water content. Six other groups of control trout were acclimated for 42 days at six different constant temperatures which coin cided with the same temperatures of the cycling fish. Muscle water content in the cycling fish was signifi cantly lower at 8°C of the cycle, but did not change signi ficantly throughout the rest of the cycle. The control fish showed a significant drop in muscle water content at 16°C and 18°C which corresponded to a rapid growth rate at these temperatures. Muscle chloride content in the cycling and control fish showed nearly constant levels even though large fluctuations in plasma chloride levels occurred. A reciprocal relationship was found between the muscle sodium and potassium levels in the cycling fish. Levels of plasma sodium, chloride, and potassium in the cycling fish were similar to the levels in the control fish held at low temperatures. Cycling fish appeared to be like cold adapted fish, in their water and electrolyte metabolism, which had acclimated to the lower end of the daily temperature cycleo It was also found that plasma chloride binding occurred in fish acclimated to temperatures of 4°C but not at 12°C. Because it appears that chloride does not distribute itself according to a Donnan distribution, the chloride space and chloride-potassium space cannot serve as valid estimates of extracellular fluid volumec The sodium space in almost all cases was smaller than the chloride space or the chloride- potassium space and was therefore used as an estimate of extracellular fluid volumeo In the controls and cycling fish the sodium space decreased significantly with either an increase in holding temperature or an increase in temperature of the cycle.