ACUTE STRESS SYNDROME OF THE YELLOW EUROPEAN EEL (ANGUILLA ANGUILLA LINNAEUS) WHEN EXPOSED TO A GRADED SWIMMING-LOAD

摘要: In a Blazka swim tunnel (length 170.0 cm; outer diameter swim-tunnel tube 28.8 cm and an inner of 19.0 cm) short-term experiments with groups 120 g eel (≈40 at different swimming velocities varying from 0.25 to 3 body lengths (BL) per second were performed. these experiments, substrates (FFA, glucose), the stress hormone cortisol, parameters ionic balance (sodium, potassium chloride) lactic acid measured in blood plasma 0 (control group), 0.25, 0.5, 0.75, 1, 1.5, 2.0, 2.5 3.0 BL/sec. It is concluded that speed up 2 BL/sec not stressful for yellow because maintained, there no evidence activation pituitary-interrenal axis anaerobic metabolism activated. However performances above showed dichotomous pattern: some animals changes while others 'acute syndrome' resulting elevated cortisol levels, glucose mobilisation, imbalance lactate accumulation. Based on observations it can be eel-like (anguilliform) more suitable long term sustained than burst activity.