Nitrite intoxication of common carp (Cyprinus carpio L.) at different water temperatures
2006
Kroupova, H. | Machova, J. | Piackova, V. | Flajshans, M. | Svobodova, Z. | Poleszczuk, G.
Common carps were exposed to nitrite (1.45 mmol/L NO2-) for 48 hours at 14 deg C and 20 deg C in order to investigate the mechanism of nitrite poisoning at these water temperatures. Nitrite exposure produced high levels of methaemoglobin (88.2% and 92.9%, resp.) at both water temperatures compared with controls (0.3% and 2.6%, resp.). High fish mortality occurred in experimental groups (30% and 51%, resp.) compared with controls (0%). Nitrite exposure also resulted in nitrite accumulation in blood plasma, liver and muscles. Plasma nitrite concentration was higher at 20 deg C (10.5 mmol/L) than at 14 deg C (5.0 mmol/L). In either event, plasma K+ levels increased and Cl- levels and osmolality remained unchanged. Plasma Na+ levels slightly decreased at 20 deg C. Poisoned fish showed lower haematocrit values than controls. At 20 deg C, the blood haematocrit decrease was accompanied by low erythrocyte count and haemoglobin level. No significant changes were observed in the mean corpuscular haemoglobin, mean corpuscular haemoglobin concentration, or selected erythrocyte dimensions (major axis, minor axis and aspect ratio).
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