The influence of some factors on blood glucose levels of tilapia zillii gerv

ABSTRACT

The influence of some factors in the determination of blood glucose levels of Tilapia zillii Gerv. Was studied. Aquarium transfer produced a significant hyperglycemia during the initial 2 hours. However, from 24 to 168 hours after transfer, the blood glucose levels were not significantly different. Asphyxiation hyperglycemia occurred during 15 minutes after net-capture and exposure to air. Starvation of 168 hours duration had no significant effect on blood glucose levels. Size of fish significantly affected blood glucose levels, e. g., younger fish had lower blood glucose levels than older ones. On the other hand, blood glucose level of the fish was temperature dependent, i. e. a decline in water temperature was accompanied by hypoglycemia and an increase in temperature producing hyperglycemia. Differences in blood glucose levels after exposure of fish to 19% salinity were not present, but fish exposed to 40% salinity had significantly higher levels. It can be concluded that the mean blood glucose levels of normal Tilapia zillii Gerv. was 37.8 +/- 12.8 mg/ 100 ml