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Whole-body calcium flux rates in cichlid teleost fish Oreochromis mossambicus adapted to freshwater

Journal Article · · Am. J. Physiol.; (United States)
OSTI ID:6287588
; ; ; ;
Radiotracer techniques were used to measure influx and efflux rates of CaS in freshwater-adapted Oreochromis mossambicus. The influx rate of CaS is related to body weight (W) as Fin = 50W0.805 nmol CaS /h. For a 20-g fish the calculated influx rate was 558 nmol CaS /h, and this was attributed largely to extraintestinal uptake since the drinking rate was estimated to be only 28 microliter water/h, which corresponds to an intake of 22.4 nmol CaS /h. The CaS efflux rate was calculated using the initial rate of appearance of radiotracer in the ambient water and the specific activity of plasma CaS . Tracer efflux rates were constant over 6-8 h, which indicated that there was no substantial loss of tracer in either the urine or the feces because this would have resulted in random bursts of tracer loss. Efflux rates then primarily represent integumentary and presumably branchial efflux rates. The efflux rate of CaS is related to body weight as Fout = 30W0.563 nmol CaS /h, which means an efflux rate of 162 nmol CaS /h for a 20-g fish. The net whole-body CaS influx, calculated as Fnet = Fin - Fout, was 396 nmol/h for a 20-g fish, which proves that the ambient water is an important source of CaS .
Research Organization:
Univ. of Nijmegen, Netherland
OSTI ID:
6287588
Journal Information:
Am. J. Physiol.; (United States), Journal Name: Am. J. Physiol.; (United States); ISSN AJPHA
Country of Publication:
United States
Language:
English

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Related Subjects

551001* -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ABSORPTION
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
AQUATIC ORGANISMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL ADAPTATION
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BODY FLUIDS
CALCIUM 45
CALCIUM COMPOUNDS
CALCIUM ISOTOPES
CATIONS
CHARGED PARTICLES
CLEARANCE
DAYS LIVING RADIOISOTOPES
EVEN-ODD NUCLEI
EXCRETION
FECES
FISHES
FRESH WATER
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTESTINAL ABSORPTION
IONS
ISOTOPES
MATERIALS
NUCLEI
OXYGEN COMPOUNDS
PHYSIOLOGY
RADIOISOTOPES
UPTAKE
URINE
VERTEBRATES
WASTES
WATER