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Journal Article
Randomized Controlled Trial
Glycemic response after glucose oral administration of wild juvenile red grouper Epinephelus morio fed two different diets.
Fish Physiology and Biochemistry 2018 Februrary
Epinephelus morio is a large carnivorous species of the Caribbean Sea under reproduction in captivity and nutritional physiology. A diet with raw cornstarch (RCS) was compared to a basal diet without starch (basal) to measure plasma glucose, liver glycogen, and intermediary metabolism. Glucose level did not change (p > 0.05) whereas liver glycogen was significantly higher in fish fed the RCS diet (137.2 ± 14.5 mg g-1 ) than in fish fed the basal diet (87.4 ± 14.5 mg g-1 ). Oral glucose administration (170 mg glucose per 100 g body weight) yielded a slight change; two peaks of plasma glucose were recorded with basal (5.6 mM L-1 ) 2 h after oral administration and at 12 h (6.4 mM L-1 ). After 24 h, with 1.7 mM L-1 , fish returned to initial stage (2.4 mM L-1 ). RCS diet produced the highest level (6.3 mM L-1 ) 2 h after oral administration; lowest level observed at 24 h after oral administration (1.0 mM L-1 ). A significant effect was detected with the presence or absence of dietary carbohydrates (CBH) on hepatic fructose 1,6-bisphosphatase and pyruvate kinase activity. Grouper used two strategies to maintain glucose homeostasis: CBH present in the diet oriented towards gluconeogenesis, whereas no dietary CBH enhanced glycolytic route to liberate glucose and increase liver glycogen.
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