Springer Online Journal Archives 1860-2000
Abstract The effect of a short period of starvation (5–6 weeks) on thechemistry of plasma and inner ear endolymph (Na+,K+, Cl-, total Ca, protein, totalCO2 concentrations and pH) was studied in trout (Oncorhynchusmykiss). In plasma, only total Ca significantly decreased, by 0.17 mM, instarved trout. A slight drop (10%) in the plasma protein content wasalso observed. Starvation induced a metabolic plasma alkalosis characterizedby a non-signifiacant increase in pH and a significant drop of 22% oftotal CO2. In endolymph, the Na+,K+, Cl- , total Ca and protein concentrationswere not significantly different in control and starved trout, but in thelatter, the pH of the endolymph was less alkaline (significant decrease of0.3 UpH) and the total CO2 concentration was significantlyreduced by 50%. Experimental starvation was selected as aphysiological situation characterized by a slowing down of both somatic andotolith growth. We propose that the reduced rate of otolith growth isdirectly related to an overall reduction in the alkalinity of theendolymph.
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