Studies on the glomerular filtration rate of rainbow trout (Salmo gairdneri).
نویسندگان
چکیده
The rainbow trout (Salmo gairdneri) and its anadromous form, the steelhead trout, maintain their milieu intbrieur hypotonic to the environment after transfer to sea water (Houston, 1959, i960). Such a transfer involves the physiological adjustment from a condition of continual hydration and electrolyte depletion to the opposite circumstance of a sustained tendency towards dehydration and excessive electrolyte intake. Part of this physiological adjustment probably involves a reduction in urine flow of a magnitude comparable to the differences seen between stenohaline freshwater and marine forms. Further, it has been suggested that such a reduction in urine flow may be achieved by a lowering of the glomerular filtration rate (G.F.R.) (Smith,i95i; Fontaine, 1956). The purpose of this study was to examine the glomerular filtration rates of freshwater-adapted and sea-water-adapted rainbow trout and also the effects of adrenocortical and posterior pituitary hormones on filtration in the freshwater form.
منابع مشابه
The effect of increased metabolic rate on renal function in the rainbow trout, Salmo Gairdneri.
1. A highly significant linear correlation was found between glomerular filtration rate and urine flow rate in both freshwater and seawater trout. The percentage tubular reabsorption of water was approximately 33% greater in seawater trout than in freshwater trout. 2. As oxygen consumption increased, the urine flow rate increased in freshwater and seawater rainbow trout. The proportional increa...
متن کاملPituitary activation by bacterial endotoxins in rainbow trout (Salmo gairdneri).
Endotoxins from Escherichia coli and Aeromonas salmonicida caused marked cortisol production in the rainbow trout (Salmo gairdneri).
متن کاملEvaluation of the net energy value of glucose (cerelose) and maize starch in diets for rainbow trout (Salmo gairdneri).
1. Quadruplicate groups of rainbow trout (Salmo gairdneri) (mean body-weight 24.9 g) were reared on six dietary treatments (practical-type diets) in a modified paired-feeding experiment for 12 weeks at 15 degrees to determine the net energy (NE) value of starch and glucose to rainbow trout. 2. Three test diets were prepared to contain (g/kg): 0 supplemented carbohydrate (diet 1), 250 maize star...
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عنوان ژورنال:
- The Journal of experimental biology
دوره 40 شماره
صفحات -
تاریخ انتشار 1963