Black and channel catfish ( Ictalurus melas and Ictalurus punctatus ) were gradually acclimated to 36°C. Ictalurus punctatus tolerated the higher temperature better than Ictalurus melas . An intravenous glucose tolerance test was performed on Ictalurus punctatus by intravenously injecting 25 mg/100 g body weight of d -glucose. Both in the control and in acclimated fish, the blood glucose peak was reached after 1 min, after 5 min it began to decrease and after 4 hr it was drastically reduced, reaching the starting level after 24 hr. There was no significant difference between the two groups of animals until the 24th hour, where the glucose level in blood was significantly higher ( P < 0.05) in acclimated fish than in control animals. Immuno-histochemical and electron microscopy studies indicated the presence of insulin-positive beta cells with characteristic cytoplasmatic electron-dense granulations, without any apparently histomorphological difference between acclimated and control fish.
Comparative Biochemistry and Physiology Part A: Physiology – Elsevier
Published: Jun 1, 1995
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