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

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

Influence of sublethal concentrations of cadmium on swimming performance of carp, cyprinus carpio

Cadmium toxicity to the carp Cyprinus carpio was determined. The 96-h LC[0], LC[50], LC[100] were 10.0, 16.6, 20.0 mg/1 cd, respectively, on the other hand, fish exposed to sublethal concentrations of cadmium [10.0; 15.0 mg/1], exhibited significant disturbances in swimming performance as measured by swimming speed, swimming time, fish and physical effect. The possible mechanisms of cadmium poisoning are discussed

Effects of cadmium on the electrocardiogram of the EEl, anguilla anguilla L

The effects of exposure to 5.0 mg/l Cd for 24 hours on the bioelectrical activity of the eel heart were studied. Fish exhibited a negative chronotropic effect and increase in the waves amplitude after Cd-treatment. These changes are found to be identical to the effects of hypoxia which point to a similar mechanism of toxicity. On the other hand, Cd-treatment induced lesions and disturbances in the eel heart muscle. The most important diagnostic features of the electrocardiogram changes are myocardial infarction, disturbances in the ionic equilibrium and low nodal rhythm. It was suggested that changes in the bioelectrical activity may be caused by gill impairment as toxic response to cadmium

Effects of acetone and ethanol on the bioelectrical activity and ventilation rate of the eel, anguilla anguilla L

The effects of acetone and ethanol on the bioelectrical activity and ventilation rate of eel fish were studied. It has been found that intoxicating dose of acetone and ethanol does not cause any major changes in the bioelectrical activity of the fish. On the other hand, acetone and ethanol produced an increase in ventilation rate to a maximum of 127.9% and 133.8%, respectively of the control values. It was concluded that acetone and ethanol may affect the results of fish toxicity tests