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Renal threshold for urinary glucose excretion by tilapia in response to orally administered carbohydrates and injected glucose. Shian-Chuann Lin1, Chyng-Hwa ...

Fish Physiology and Biochemistry 23: 127–132, 2000. © 2000 Kluwer Academic Publishers. Printed in the Netherlands.

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Renal threshold for urinary glucose excretion by tilapia in response to orally administered carbohydrates and injected glucose Shian-Chuann Lin1, Chyng-Hwa Liou1 and Shi-Yen Shiau2,∗ 1 Department

of Aquaculture, National Taiwan Ocean University, Keelung 202, Taiwan; 2 Department of Food Science, National Taiwan Ocean University, Keelung 202, Taiwan; ∗ Author for correspondence (Phone: +886-2-2462-2192, Ext. 5106; Fax: +886-2-2462-1684; E-mail: [email protected]) Accepted: August 8, 2000

Key words: carbohydrate, kidney threshold of urinary glucose, tilapia, urine glucose

Abstract Two experiments, oral carbohydrate administration (Experiment 1) and vein glucose injection (Experiment 2), were conducted to gain more insight into the ability of hybrid tilapia, Oreochromis niloticus × O. aureus, to utilize different carbohydrates and to establish the kidney threshold for urinary glucose excretion. In Experiment 1, both glucose and starch were administered orally after the tilapia were fasted for 24 h. Plasma and urine were sampled from the fish at selected time intervals from 1 to 24 h thereafter. Higher (p

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